brain

tamnd's digital brain — notes, problems, research

43815 notes

另一方面 (lìng yī fāngmiàn) — on the other hand

HSK 5 | phrase / conjunction | on the other hand, from another angle

hsk-5vocabularyb2
综述 (zōngshù) — to synthesize; review article

HSK 6 | verb/noun | to synthesize existing research; a comprehensive literature review

hsk-6vocabularyc1
〜にとって — JLPT N3 Grammar

Learn 〜にとって (for, from the perspective of) — the N3 pattern for marking the evaluating perspective in value judgments and assessments.

japanesegrammarn3jlpt
最 (zuì) — most; -est (superlative)

HSK 2 | adverb | superlative marker placed before adjectives and verbs

hsk-2vocabularya1
不得不 (bùdébù) — Have no choice but to / must

HSK 4 | adverb | expressing reluctant necessity

hsk-4vocabularyb1
Food Vocabulary

Japanese food and drink vocabulary: common foods, drinks, cooking methods, restaurant expressions, and traditional Japanese cuisine terms.

japanesevocabularyfoodjlpt-n5language-learning
火 — Kanji Reference

火 (fire): 4 strokes, JLPT N5. On: カ. Kun: ひ、ほ.

japanesekanjin5writing
几乎 (jīhū) — almost

HSK 3 | adverb | almost, nearly, hardly — very close to a condition but not quite reaching it

hsk-3vocabularya2
Lesson 15: HSK 1 Review and Practice

A comprehensive review of all A1 grammar patterns and the top 50 most useful HSK 1 words, with practice exercises.

hsk-1lessona1
〜はもとより — JLPT N2 Grammar

Learn how to use 〜はもとより (wa motoyori) to express 'not only ~ but also' when the first item is so obvious it goes without saying. Includes structure, nuance, examples, and comparisons.

japanesegrammarn2jlpt
読 — JLPT N5 Kanji

読 (doku/toku/tou/yo-mu): read. JLPT N5 kanji.

japanesekanjin5jlpt
案例 (ànlì) — case, case study

HSK 5 | noun | a specific instance or example used for analysis, typically in law, medicine, or business

hsk-5vocabularyb2
入 — Kanji Reference

入 (enter): 2 strokes, JLPT N5. On: ニュウ. Kun: い-る、い-れる、はい-る.

japanesekanjin5writing
文脉 (wénmài) — cultural lineage, textual thread

HSK 6 | n | the continuous thread of cultural or textual tradition; the vein of meaning running through a text

hsk-6vocabularyc1
上市 (shàngshì) — to go public / to come to market

HSK 5 | verb | to list on stock market; to come onto the market

hsk-5vocabularyb2
准时 (zhǔnshí) — on time; punctual

HSK 3 | adjective/adverb | arriving or happening at the scheduled time

hsk-3vocabularya2
Lesson 25: HSK 5 Review

Comprehensive review of B2-level grammar patterns, key vocabulary, and communication strategies developed across the 25-lesson HSK 5 curriculum.

hsk-5lessonb2
从此 (cóngcǐ) — from this time on; henceforth; since then

HSK 3 | adverb | marks a turning point after which everything that follows is different

hsk-3vocabularya2
立刻 (lìkè) — immediately; at once; right away

HSK 4 | adverb | expressing immediate action without delay

hsk-4vocabularyb1
Lesson 2: Passive Voice with 被

Learn how to express passive constructions in Chinese using 被, 让, and 叫, and understand when passive voice is appropriate in Mandarin.

hsk-3lessona2
CF 456A - Laptops

We are given a collection of laptops. Each laptop has a price and a quality value. Prices are all distinct, and qualities are all distinct. Dima believes that a more expensive laptop must always have better quality. Alex claims that this is not necessarily true.

codeforcescompetitive-programmingsortings
〜において/〜における — JLPT N3 Grammar

Learn the formal conjunctive particle 〜において (in, at — domain marker) and its attributive form 〜における, essential for N3 reading and formal written Japanese.

japanesegrammarn3jlpt
川 — JLPT N5 Kanji

川 (sen/kawa): river. JLPT N5 kanji.

japanesekanjin5jlpt
百 (bǎi) — hundred

HSK 1 | number | one hundred; used in compound numbers

hsk-1vocabularya1
CF 478C - Table Decorations

We have three types of balloons: red, green, and blue. Each table at a banquet requires exactly three balloons, and no table can have all three balloons of the same color.

codeforcescompetitive-programminggreedy
商店 (shāngdiàn) — shop, store

HSK 1 | noun | shop, retail store

hsk-1vocabularya1
证明 (zhèngmíng) — to prove; proof; certificate

HSK 5 | verb / noun | to demonstrate the truth of something; a document proving a fact

hsk-5vocabularyb2
解决 (jiějué) — to solve

HSK 3 | verb | to solve, resolve, or settle a problem or difficulty

hsk-3vocabularya2
掌握 (zhǎngwò) — to master; to grasp; to command

HSK 4 | verb | to have thorough command of a skill or knowledge

hsk-4vocabularyb1
改变 (gǎibiàn) — to change, to alter

HSK 5 | verb/noun | deliberate alteration of something existing

hsk-5vocabularyb2
〜わけにはいかない — JLPT N3 Grammar

Learn 〜わけにはいかない (can't possibly do ~, not in a position to ~) — expressing social, moral, or practical impossibility.

japanesegrammarn3jlpt
累 (lèi) — tired; exhausted

HSK 3 | adjective | feeling tired or worn out

hsk-3vocabularya2
及时 (jíshí) — timely; in good time; promptly

HSK 3 | adjective/adverb | done without unnecessary delay when needed

hsk-3vocabularya2
联系 (liánxì) — to contact; to get in touch; connection

HSK 4 | verb / noun | establishing or maintaining a link between people or things

hsk-4vocabularyb1
失望 (shīwàng) — disappointed; to lose hope

HSK 3 | adjective/verb | to feel let down; to be disappointed

hsk-3vocabularya2
支持 (zhīchí) — to support, support

HSK 5 | verb / noun | to back or endorse; backing, support

hsk-5vocabularyb2
比如 (bǐrú) — for example

HSK 4 | conjunction / phrase | for example; for instance; such as

hsk-4vocabularyb1
考虑 (kǎolǜ) — to consider; to think over

HSK 4 | verb | to think carefully about something

hsk-4vocabularyb1
研讨 (yántǎo) — to discuss; to deliberate

HSK 5 | verb | to research and discuss; to deliberate in a seminar setting

hsk-5vocabularyb2
Lesson 9: Sequence Expressions

Learn how to organize information in temporal order using 先...再/然后...最后 and related sequence markers essential for narration and instruction.

hsk-3lessona2
传媒 (chuánméi) — media; mass media

HSK 5 | noun | media; mass media; communications industry

hsk-5vocabularyb2
公平 (gōngpíng) — fair, equitable

HSK 5 | adjective/noun | treating all parties equally without bias or favoritism

hsk-5vocabularyb2
〜ば — Japanese Grammar

〜ば: JLPT N4 grammar pattern. Usage, structure, examples, and comparison with similar patterns.

japanesegrammarn4conditional
Technology & Media

Esperanto vocabulary for computers, internet, social media, technology, and modern digital life.

esperantovocabularytechnologyinternetcomputersmedia
号召 (hàozhào) — to call on; to appeal to; call

HSK 4 | verb / noun | rallying people to a cause or action

hsk-4vocabularyb1
Lesson 12: Adjectives & Adverbs

Sindarin adjectives: post-nominal position, lenition rule, singular and plural agreement, comparison forms, and how to form adverbs.

sindaringrammaradjectivesadverbsintermediate
感悟 (gǎnwù) — insight; realization; to come to understand

HSK 5 | noun/verb | insight gained through experience; to realize through reflection

hsk-5vocabularyb2
CF 449A - Jzzhu and Chocolate

We have an $n times m$ chocolate bar made of unit squares. A cut is either horizontal or vertical, must follow grid lines, must lie strictly inside the chocolate, and cannot duplicate a previous cut.

codeforcescompetitive-programminggreedymath
空 — JLPT N5 Kanji

空 (kuu/sora): sky. JLPT N5 kanji.

japanesekanjin5jlpt
果然 (guǒrán) — as expected; sure enough; indeed

HSK 3 | adverb | confirms that reality matched a prior prediction or expectation

hsk-3vocabularya2
区块链 (qūkuài liàn) — blockchain

HSK 5 | noun | a distributed digital ledger technology for recording transactions securely

hsk-5vocabularyb2
听懂 (tīngdǒng) — to understand by hearing

HSK 3 | verb | to understand through listening, to catch what is said

hsk-3vocabularya2
Family Vocabulary

Japanese family vocabulary: parents, siblings, relatives, honorific vs. plain forms, and family-related expressions.

japanesevocabularyfamilyjlpt-n5language-learning
认识 (rènshi) — to know (a person); to recognize

HSK 1 | verb | to be acquainted with someone; to recognize something

hsk-1vocabularya1
病人 (bìngrén) — patient, sick person

HSK 4 | noun | a person who is ill or receiving medical treatment

hsk-4vocabularyb1
醋 (cù) — vinegar / jealousy

HSK 3 | noun | vinegar (condiment); colloquially, jealousy in a romantic context

hsk-3vocabularya2
Lesson 10: C1 Review and Path to C2

A comprehensive C1 mastery audit, 300 essential advanced vocabulary items, precise C1 can-do statements, and a structured roadmap for reaching C2.

esperantoc1lesson
天 — Kanji Reference

天 (heaven, sky): 4 strokes, JLPT N5. On: テン. Kun: あめ、あま.

japanesekanjin5writing
Lesson 8: Expressing Regret

Express regret, missed opportunities, and relief using 要是...就好了, 早知道...就, 可惜, and related patterns at B1 level.

hsk-4lessonb1
审视 (shěnshì) — to scrutinize, to examine critically

HSK 6 | verb | to look at carefully and critically; to examine with discernment

hsk-6vocabularyc1
丢 (diū) — to lose; to misplace

HSK 3 | verb | to lose or accidentally leave something behind

hsk-3vocabularya2
空 — Kanji Reference

空 (sky, empty): 8 strokes, JLPT N5. On: クウ. Kun: そら、あ-く、から.

japanesekanjin5writing
促进 (cùjìn) — to promote; to advance

HSK 5 | verb | to promote; to facilitate; to further

hsk-5vocabularyb2
释然 (shìrán) — relieved; at ease; unburdened

HSK 5 | adjective | feeling relief and peace of mind after worry or tension is resolved

hsk-5vocabularyb2
激发 (jīfā) — Stimulate, trigger, arouse

HSK 5 | verb | to stimulate, trigger, or arouse a feeling, potential, or reaction

hsk-5vocabularyb2
〜にあたって / 〜に当たり — JLPT N2 Grammar

Learn 〜にあたって and 〜に当たり to mark significant occasions — openings, ceremonies, launches — in formal Japanese speeches and documents.

japanesegrammarn2jlpt
JLPT N2 Lesson 4: Nuanced Negation

Master the art of indirect communication by learning how to express complex limitations, obligations, and partial negations in professional Japanese.

japanesen2lessonjlpt
充分 (chōngfèn) — sufficient; full; ample

HSK 4 | adjective | fully adequate in amount or degree

hsk-4vocabularyb1
Lesson 2: Oral Defense Mastery

Achieving mastery in Chinese academic defense and Q&A: from competent performance to intellectual authority.

hsk-9lessonc2
完全 (wánquán) — completely; entirely; total; perfect

HSK 3 | adv/adj | to a total or absolute degree

hsk-3vocabularya2
自信 (zìxìn) — confident / confidence

HSK 4 | adjective / noun | confident; self-confident; confidence

hsk-4vocabularyb1
引领 (yǐnlǐng) — to lead; to pioneer; to show the way

HSK 5 | verb | to lead the way forward, often inspiring others to follow

hsk-5vocabularyb2
困惑 (kùnhuò) — confused; perplexed

HSK 5 | adjective / verb | confused, perplexed, puzzled; to confuse, to perplex

hsk-5vocabularyb2
N4 Kanji: 頭 (Head)

JLPT N4 kanji 頭 — readings, vocabulary, stroke order, mnemonic, and common confusion pairs.

japanesen4jlptkanjilanguage-learning
Sindarin Communities

Where to find other Sindarin learners and scholars — Discord servers, Reddit, forums, and academic mailing lists.

sindarincommunitytolkienlearning
放心 (fàngxīn) — to rest assured; to stop worrying

HSK 3 | verb | to feel at ease; to set one's mind at rest

hsk-3vocabularya2
读 (dú) — to read (aloud); to study

HSK 1 | verb | to read text aloud or to study at an institution

hsk-1vocabularya1
习惯 (xíguàn) — habit; to be used to

HSK 3 | noun/verb | a repeated behavior, or to be accustomed to something

hsk-3vocabularya2
操场 (cāochǎng) — playground / sports ground

HSK 3 | noun | playground, sports field, schoolyard

hsk-3vocabularya2
HSK 2 Vocabulary (New Words)

HSK 2 vocabulary: ~200 new words added at level 2 (cumulative 498). Comprehensive table with Chinese, pinyin, English, part of speech, and examples.

chinesehsk2vocabularyelementaryhsk
假期 (jiàqī) — vacation / holiday period

HSK 3 | noun | a period of time away from work or school

hsk-3vocabularya2
才能 (cáinéng) — talent; ability; capability

HSK 3 | noun | innate talent or acquired ability

hsk-3vocabularya2
威胁 (wēixié) — Threaten

HSK 4 | verb/noun | to threaten; threat

hsk-4vocabularyb1
JLPT N2 — Exam Preparation

Complete N2 exam preparation: format breakdown, section strategies, 6-month study plan from N3, 60 kanji reading drills, 60 grammar drills, and most commonly failed patterns.

japanesejlptjlpt-n2exam-preplanguage-learning
演变 (yǎnbiàn) — to evolve, to develop gradually

HSK 5 | verb/noun | gradual evolution or development over time

hsk-5vocabularyb2
Lesson 4: Cum Clauses

Master all five uses of cum with the subjunctive and indicative, including the tricky cum inversum.

latinintermediatelesson
虽然 (suīrán) — although / even though

HSK 4 | conjunction | although; even though; though

hsk-4vocabularyb1
所以 (suǒyǐ) — so; therefore

HSK 1 | conjunction | introduces a result or conclusion, paired with 因为

hsk-1vocabularya1
土 — JLPT N5 Kanji

土 (do/to/tsuchi): earth. JLPT N5 kanji.

japanesekanjin5jlpt
按照 (ànzhào) — according to; in accordance with

HSK 4 | preposition | following a standard or instruction

hsk-4vocabularyb1
督促 (dūcù) — to urge; to supervise and push

HSK 5 | verb | to urge someone to do something through supervision or prompting

hsk-5vocabularyb2
丰富 (fēngfù) — rich; abundant; to enrich

HSK 4 | adjective / verb | having or providing plentiful variety and substance

hsk-4vocabularyb1
CF 462A - Appleman and Easy Task

We are given an n×n board, where each cell contains either an 'x' or an 'o'. The task is to check a local property for every cell: whether the number of orthogonally adjacent cells containing 'o' is even.

codeforcescompetitive-programmingbrute-forceimplementation
法律 (fǎlǜ) — Law, legal

HSK 5 | noun | the body of rules and regulations enforced by the state

hsk-5vocabularyb2
〜に基づいて — JLPT N2 Grammar

Learn how to use 〜に基づいて (ni motozuite) to express 'based on' when grounding decisions, arguments, or actions in formal sources. Includes structure, nuance, examples, and comparisons.

japanesegrammarn2jlpt
媒体 (méitǐ) — media; medium

HSK 4 | noun | channels of mass communication

hsk-4vocabularyb1
迟到 (chídào) — to be late; to arrive late

HSK 2 | verb | verb-object compound meaning to arrive or show up after the expected time

hsk-2vocabularya1
〜によって/〜による — JLPT N3 Grammar

Master all four uses of 〜によって at N3: agent in passive, means/method, cause, and variation depending on condition.

japanesegrammarn3jlpt
总之 (zǒngzhī) — in short; in a word

HSK 4 | conjunction / adverb | in short; in summary; in a word

hsk-4vocabularyb1
不妨 (bùfáng) — might as well, there is no harm in

HSK 6 | adv | suggesting that an action is harmless or worth trying; equivalent to 'might as well' or 'why not'

hsk-6vocabularyc1