brain

tamnd's digital brain — notes, problems, research

43815 notes

背景 (bèijǐng) — background; context; backdrop

HSK 4 | noun | the background or context of a situation

hsk-4vocabularyb1
Sindarin Action Words (Verbs)

Core Sindarin verbs with present, past, and future forms — organized by category for practical composition.

sindarinvocabularyverbstolkien
〜として — JLPT N3 Grammar

Learn 〜として (as, in the capacity of) — the N3 pattern for expressing roles, identities, functions, and premises.

japanesegrammarn3jlpt
护士 (hùshi) — nurse

HSK 3 | noun | nurse — medical professional who cares for patients

hsk-3vocabularya2
〜に至って / 〜に至っては — JLPT N1 Grammar

N1 grammar pattern 〜に至って(は): expressing 'now that it has come to ~, upon reaching this extreme point, at this point finally.'

japanesegrammarn1jlpt
JLPT N3 Lesson 3: Complex Conjunctions I — Location and Stance

Master four essential N3 formal conjunctions: 〜において/〜における (in/at), 〜に対して/〜に対する (toward/against), 〜にとって (for/from the perspective of), and 〜として (as/in the capacity of).

japanesen3lessonjlptgrammarconjunctions
块 (kuài) — measure word for chunks and yuan

HSK 1 | measure word | classifier for chunks, pieces, and Chinese yuan

hsk-1vocabularya1
参加 (cānjiā) — Participate

HSK 4 | verb | to participate, to join, to attend

hsk-4vocabularyb1
Lesson 3: Family Members

Learn Chinese family vocabulary, how to express possession with 的, and how to talk about what you have using 有.

hsk-1lessona1
促使 (cùshǐ) — to prompt; to cause; to drive

HSK 5 | verb | to prompt; to cause; to drive someone to do something

hsk-5vocabularyb2
低 (dī) — low / below average

HSK 3 | adjective | at a small height or below a standard level

hsk-3vocabularya2
哪 (nǎ) — which

HSK 1 | pronoun/determiner | interrogative asking for selection among options

hsk-1vocabularya1
目标 (mùbiāo) — goal; target

HSK 3 | noun | a goal, target, or objective to aim for

hsk-3vocabularya2
专业 (zhuānyè) — major; specialty; professional

HSK 3 | noun / adjective | major field of study; specialized skill or knowledge

hsk-3vocabularya2
需求 (xūqiú) — demand; need; requirement

HSK 5 | noun | an economic, practical, or personal need or demand for something

hsk-5vocabularyb2
有必要 (yǒu bìyào) — it is necessary

HSK 4 | phrase | it is necessary; there is a need

hsk-4vocabularyb1
错 (cuò) — wrong; mistake; bad

HSK 2 | adjective/noun | incorrect; a mistake or error

hsk-2vocabularya1
前 — JLPT N5 Kanji

前 (zen/mae): before. JLPT N5 kanji.

japanesekanjin5jlpt
打算 (dǎsuàn) — to plan

HSK 3 | verb / noun | to plan, intend to do something; a plan or intention

hsk-3vocabularya2
〜さえ〜ば — JLPT N3 Grammar

Learn 〜さえ〜ば (if only ~, as long as ~) — the N3 conditional expressing a single minimal sufficient condition.

japanesegrammarn3jlpt
奇怪 (qíguài) — strange

HSK 3 | adjective | strange, odd, weird — outside the normal or expected

hsk-3vocabularya2
〜ものを (regret / reproach — it should have been)

N1 grammar pattern 〜ものを expressing regret about an unrealised alternative or reproach toward someone who failed to do something they should have. Literary and formal register.

japanesen1grammarjlptものをregretreproach
吃惊 (chījīng) — to be surprised; to be shocked

HSK 4 | verb | experiencing sudden surprise or shock

hsk-4vocabularyb1
需求 (xūqiú) — demand; need; requirement

HSK 4 | noun | what is needed or wanted, especially in an economic or practical sense

hsk-4vocabularyb1
〜に先立って — JLPT N2 Grammar

Learn how to use 〜に先立って (ni sakidatte) to express 'prior to' or 'before' when an action precedes an important event. Includes structure, nuance, examples, and comparisons.

japanesegrammarn2jlpt
Supplement 2: Complete Verb Paradigm Reference

Master reference for all Sindarin verb conjugation: all 12 verb classes, all tenses/moods, all 9 persons — with full tables for model verbs and notes on scholarly disagreements.

sindaringrammarverbsreferenceadvanced
公司 (gōngsī) — company; firm

HSK 2 | noun | a business company or corporation

hsk-2vocabularya1
JLPT N1 — Vocabulary

Complete JLPT N1 vocabulary reference: ~4,000 new words beyond N2 covering academic, literary, political, legal, medical, and financial Japanese with readings, meanings, and usage contexts.

japanesejlptjlpt-n1vocabularylanguage-learning
汇报 (huìbào) — to report

HSK 4 | verb / noun | to report; to brief; a report

hsk-4vocabularyb1
駅 — Kanji Reference

駅 (station): 14 strokes, JLPT N5. On: エキ. Kun: none.

japanesekanjin5writing
偏见 (piānjiàn) — prejudice, bias

HSK 5 | noun | an unfair preconceived opinion not based on reason or experience

hsk-5vocabularyb2
珍惜 (zhēnxī) — Cherish, treasure, value

HSK 5 | verb | to value highly and make good use of; to cherish

hsk-5vocabularyb2
Lesson 27: Relative Pronouns & Uncertainty

Sindarin relative pronoun i, relative clause structures, expressing uncertainty and probability, and the particle ma for questions and possibility.

sindaringrammarrelative-clausesadvanced
方法论 (fānfǎlùn) — methodology

HSK 5 | noun | systematic study or framework of methods used in a discipline

hsk-5vocabularyb2
然而 (rán'ér) — however; but; nevertheless

HSK 4 | conjunction | a formal connector meaning however or nevertheless

hsk-4vocabularyb1
缩小 (suōxiǎo) — to reduce, to narrow, to shrink

HSK 5 | verb | deliberate or observed reduction in scope, size, or gap

hsk-5vocabularyb2
JLPT N4 — Exam Preparation

Complete N4 exam prep: format guide, 25 vocabulary questions, 25 grammar questions, reading passages with questions, listening scenarios, 60-day study plan, and N5→N4 pitfall guide.

japanesejlptjlpt-n4exam-preplanguage-learning
顾虑 (gùlǜ) — concern; misgiving; worry

HSK 5 | noun/verb | a hesitating worry or reservation that holds one back from acting

hsk-5vocabularyb2
JLPT N3 — Exam Preparation

Complete N3 exam preparation guide: test format, question type breakdowns, 90-day study plan from N4, most-confusable grammar pairs, kanji reading drills, and test-day strategies.

japanesejlptjlpt-n3exam-preplanguage-learning
年 (nián) — year

HSK 1 | noun | a calendar year; also used in age and duration expressions

hsk-1vocabularya1
以为 (yǐwéi) — to think (incorrectly)

HSK 3 | verb | to mistakenly believe something to be true

hsk-3vocabularya2
比较…一点 (bǐjiào...yīdiǎn) — comparatively... a bit

HSK 3 | grammar pattern | softens a comparative or evaluative statement with 'a bit'

hsk-3vocabularya2grammar
你好 (nǐ hǎo) — hello; hi

HSK 1 | greeting phrase | standard informal greeting for one person

hsk-1vocabularya1
修辞 (xiūcí) — rhetoric, rhetorical device

HSK 5 | n | the art of effective language use; a rhetorical figure or device

hsk-5vocabularyb2
CF 472C - Design Tutorial: Make It Nondeterministic

We are given a list of people, each with a first name and a last name. For each person, we have the freedom to choose either their first or last name as a handle.

codeforcescompetitive-programminggreedy
CF 449C - Jzzhu and Apples

We have apples numbered from 1 to n. We want to create as many disjoint pairs as possible such that the two numbers in each pair have greatest common divisor greater than 1. Each apple can appear in at most one pair.

codeforcescompetitive-programmingconstructive-algorithmsnumber-theory
告诉 (gàosu) — to tell; to inform

HSK 2 | verb | to communicate information to someone

hsk-2vocabularya1
体现 (tǐxiàn) — to embody; to reflect

HSK 5 | verb / noun | to embody; to give expression to

hsk-5vocabularyb2
租 (zū) — to rent

HSK 3 | verb / noun | to rent, to hire; rent, rental fee

hsk-3vocabularya2
海平面 (hǎi píngmiàn) — Sea level

HSK 5 | noun | the average height of the ocean surface used as a reference point

hsk-5vocabularyb2
JLPT N5 — Grammar (All ~100 Patterns)

Complete JLPT N5 grammar reference: all ~100 grammar patterns with structure formulas, usage explanations, example sentences (Japanese + romaji + English), and notes on common mistakes.

japanesejlptjlpt-n5grammarlanguage-learning
债券 (zhàiquàn) — bond; debenture

HSK 5 | noun | bond; debenture; fixed-income debt security

hsk-5vocabularyb2
经济 (jīngjì) — economy; economics; financial

HSK 3 | noun/adj | the system of production and consumption; economical

hsk-3vocabularya2
工作 (gōngzuò) — work; to work

HSK 1 | noun/verb | employment, labor; to be employed or carry out a task

hsk-1vocabularya1
没关系 (méi guānxi) — it's okay; no problem

HSK 1 | greeting phrase | reassures someone after an apology

hsk-1vocabularya1
根据 (gēnjù) — according to; based on; basis

HSK 4 | preposition / noun | using something as a foundation or source

hsk-4vocabularyb1
Lesson 41: Elision

Sindarin vowel elision: when final and initial vowels contract, apostrophe usage, elision in poetry and prose, and the famous Elvish examples from Tolkien's texts.

sindaringrammarelisionphonologyadvanced
强调 (qiángdiào) — to emphasize; to stress

HSK 4 | verb | to give special weight or importance to a point

hsk-4vocabularyb1
梳理 (shūlǐ) — to comb through, to organize

HSK 6 | verb | to sort through and organize systematically; to untangle

hsk-6vocabularyc1
成本 (chéngběn) — cost; production cost

HSK 5 | noun | cost; production cost; the amount spent to produce or achieve something

hsk-5vocabularyb2
严谨 (yánjǐn) — rigorous; meticulous; precise

HSK 5 | adjective | rigorous; meticulous; careful and thorough

hsk-5vocabularyb2
合作 (hézuò) — to cooperate; cooperation

HSK 5 | verb / noun | to cooperate, to collaborate; cooperation, collaboration

hsk-5vocabularyb2
对于 (duìyú) — regarding; with respect to; as for

HSK 4 | preposition | indicating the object of an action or attitude

hsk-4vocabularyb1
来 — JLPT N5 Kanji

来 (rai/ku-ru): come. JLPT N5 kanji.

japanesekanjin5jlpt
CF 475F - Meta-universe

We are given a set of points on an infinite 2D grid, representing planets in a "meta-universe." The goal is to repeatedly split the set of planets along empty rows or columns that completely separate the set into two non-empty subsets, each lying on one side of the row or column.

codeforcescompetitive-programmingdata-structures
新 (xīn) — new

HSK 1 | adjective | new, fresh, modern

hsk-1vocabularya1
前 — Kanji Reference

前 (before, front): 9 strokes, JLPT N5. On: ゼン. Kun: まえ.

japanesekanjin5writing
描写 (miáoxiě) — to describe / depict

HSK 3 | verb | to describe, to depict, to portray in writing or speech

hsk-3vocabularya2
船 (chuán) — boat; ship

HSK 2 | noun | any watercraft, from a small rowboat to a large ship

hsk-2vocabularya1
一方面…另一方面 (yī fāngmiàn… lìng yī fāngmiàn) — On one hand… on the other hand

HSK 4 | grammar pattern | presenting two contrasting or complementary aspects

hsk-4vocabularyb1
Lesson 11: Weather and Seasons

Learn to describe the weather and seasons, using impersonal verbs and the conjunction ĉar.

esperantoa1lesson
听 (tīng) — to listen, to hear

HSK 1 | verb | to listen to or hear something

hsk-1vocabularya1
温度 (wēndù) — temperature

HSK 3 | noun | temperature — measurable degree of heat or cold

hsk-3vocabularya2
号 (hào) — number; day of the month

HSK 1 | noun | a number or code; the colloquial word for a day of the month

hsk-1vocabularya1
模型 (móxíng) — model; template

HSK 4 | noun | a model, template, or small-scale replica

hsk-4vocabularyb1
Lesson 9: Phone & Communication

Handle phone calls, send messages, and communicate digitally in Chinese with confidence.

hsk-2lessona1
为了 (wèile) — in order to, for the sake of

HSK 2 | preposition | in order to, for the purpose of

hsk-2vocabularya1
背景 (bèijǐng) — background; backdrop

HSK 5 | noun | background, backdrop, context, personal connections

hsk-5vocabularyb2
医生 (yīshēng) — Doctor

HSK 4 | noun | doctor, physician

hsk-4vocabularyb1
出口 (chūkǒu) — export; exit

HSK 5 | noun/verb | to export goods; an exit or way out

hsk-5vocabularyb2
道理 (dàolǐ) — reason; logic; truth; principle

HSK 3 | noun | the reasoning or principle behind something

hsk-3vocabularya2
N4 Kanji: 雪 (Snow)

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

japanesen4jlptkanjilanguage-learning
N4 Kanji: 社 (Company, Society)

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

japanesen4jlptkanjilanguage-learning
资质 (zīzhì) — qualification; aptitude

HSK 5 | noun | innate ability or formal qualification for a role

hsk-5vocabularyb2
总共 (zǒnggòng) — in total; altogether; in all

HSK 4 | adverb | expressing a combined total

hsk-4vocabularyb1
感激 (gǎnjī) — to be grateful

HSK 3 | verb | to feel deep gratitude toward someone

hsk-3vocabularya2
系统 (xìtǒng) — systematic; system

HSK 6 | adj/noun | organized and comprehensive; a structured system

hsk-6vocabularyc1
特征 (tèzhēng) — characteristic, feature

HSK 5 | noun | distinctive feature or characteristic that identifies something

hsk-5vocabularyb2
拒绝 (jùjué) — Refuse

HSK 4 | verb | to refuse, to reject, to decline

hsk-4vocabularyb1
条约 (tiáoyuē) — treaty

HSK 5 | noun | a formally concluded and ratified agreement between states

hsk-5vocabularyb2
展示 (zhǎnshì) — to display; to show; to demonstrate

HSK 4 | verb | to present or show something to others

hsk-4vocabularyb1
表明 (biǎomíng) — to indicate; to make clear; to show

HSK 4 | verb | to clearly express or demonstrate something

hsk-4vocabularyb1
胜利 (shènglì) — victory, win; to win

HSK 4 | n/v | a successful outcome in a contest or struggle

hsk-4vocabularyb1
同事 (tóngshì) — colleague

HSK 3 | noun | colleague, coworker — someone who works at the same place

hsk-3vocabularya2
电子邮件 (diànzǐ yóujiàn) — email

HSK 3 | noun | email, electronic mail message

hsk-3vocabularya2
〜べし / 〜べからず (classical should / must not)

N1 grammar: classical auxiliary べし expressing obligation/certainty, and its negative form べからず (must not). Appears in laws, school rules, mottos, and literary contexts.

japanesen1grammarjlptべしべからずclassical Japanese
出现 (chūxiàn) — to appear / to emerge / to occur

HSK 3 | verb | to come into view or to happen for the first time

hsk-3vocabularya2
Sindarin Websites

Best websites for learning and researching Sindarin: grammar references, tools, encyclopedias, and specialized resources.

sindarinwebsitesresourcestolkien
打电话 (dǎ diànhuà) — to make a phone call

HSK 1 | verb phrase | to make a phone call

hsk-1vocabularya1
勤奋 (qínfèn) — diligent; hardworking; industrious

HSK 3 | adjective | putting in consistent hard work and effort

hsk-3vocabularya2