brain

HSK 3 | adjective | of great significance or consequence; not to be overlooked

HSK 5 | verb / noun | to develop; to open up resources or products

HSK 3 | adjective/verb | to feel sad; to be hurt emotionally

HSK 2 | adverb | again (past repetition), also, and (linking two qualities)

HSK 5 | noun/adjective | academic major; professional field; specialized

George wants to maximize his earnings by choosing segments of work from a list of tasks, each with a given profit. The tasks are arranged sequentially in an array p of length n. He must select exactly k non-overlapping segments, each of length m.

HSK 7 | verb | clinical administration of pharmaceutical agents in therapeutic contexts

Learn to tell the time, name days of the week and months, and use temporal adverbs and the correlative -am series.

HSK 5 | n/v | a symbol or symbolic representation; the act of symbolizing

HSK 4 | verb | pulling someone's attention or interest toward something

Learn how to use 〜てしかたがない (te shikataganai) to express uncontrollable feelings or irresistible urges — 'can't help but ~; irresistibly ~.' Includes structure, nuance, examples, and comparisons.

HSK 4 | verb / noun | to encourage; encouragement

Intermediate Sindarin: all 5 mutations, the full verb system, Tengwar writing, and composing original sentences — goals and resources for 100–300 hours.

Mastering literary devices, aesthetic vocabulary, and the expressive architecture of Chinese literary prose and poetry.

HSK 4 | noun | knowledge, learning

HSK 5 | verb | to check and confirm the accuracy or truth of information

HSK 4 | adjective/verb | abstract; to abstract

HSK 1 | noun | the period from roughly 8 a.m. to noon

Discuss technology and innovation using 利用 + tech + V and vocabulary for AI, big data, and the internet at B1 level.

We have n flower boxes. From box i, we may take any number of flowers between 0 and f[i], inclusive. The colors are distinct, so a selection is completely described by how many flowers we take from each box.

HSK 4 | noun | applied knowledge, skill, or technological capability

HSK 5 | verb | to feel profound respect and admiration for someone's character or achievements

HSK 4 | adverb/verb | one by one or each in their own way

HSK 5 | noun/adjective | reason; rational thinking; based on logic rather than emotion

Learn 〜のもとで and 〜のもとに to express acting under conditions, authority, supervision, or established premises.

We are given a set of $n$ people who must be partitioned into exactly $m$ non-empty groups. Once the grouping is fixed, every pair of people inside the same group becomes a friendship.

HSK 6 | n | the course or advancement of a process, especially a large-scale historical or social development

HSK 1 | noun | teacher, instructor

Express a full range of emotions in Esperanto, describe how you feel, use -iĝ- for emotional changes, and comfort others in conversation.

HSK 3 | noun / conjunction | result, outcome; as a result, consequently

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

Passive voice endings for all conjugations in present, imperfect, and future indicative; agent vs. means constructions; and a preview of the perfect passive.

HSK 5 | verb / noun | to conduct negotiations; a negotiation process

HSK 5 | adjective | open, clear, and free from concealment; transparent

HSK 6 | verb | to collect and organize into a summary; to reason inductively

長 (chou/naga-i): long. JLPT N5 kanji.

Mastering persuasive speech, rhetorical devices, signposting, ceremonial language, and Q&A in formal Esperanto public contexts.

HSK 4 | noun | a physical or figurative path or bearing

N1 grammar: classical auxiliary たる used as a prenominal adjective expressing 'being X in the full, proper sense.' Appears in formal titles, literary descriptions, and elegant prose.

Understand the structure, expectations, and preparation strategies for the KER C2 (Komuna Eŭropa Referenckadro C2) Esperanto examination held at the Universala Kongreso.

Top 10 mistakes English speakers make in Esperanto — grammar errors, pronunciation issues, and common misconceptions.

HSK 8 | noun | materials science; the interdisciplinary study of material structure, properties, and applications

HSK 5 | noun | computer software or an application

特別な (とくべつな / tokubetsu na): special. N4 level Japanese vocabulary.

HSK 4 | verb | to put a plan, policy, or measure into practice

HSK 4 | noun | the audience watching a performance or show

HSK 3 | adjective/verb | feeling nervous or embarrassed in social situations

HSK 2 | pronoun | refers to all the people in a group

Esperanto vocabulary for time, days of the week, months, seasons, and time expressions.

HSK 4 | n | physical training, sports, or PE as a subject

N1 grammar pattern 〜きらいがある: expressing a negative tendency or inclination — 'has a tendency to' when the tendency is considered a fault or problem.

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

見 (see, look): 7 strokes, JLPT N5. On: ケン. Kun: み-る、み-える.

全然 (ぜんぜん / zenzen): not at all (+ negative). N4 level Japanese vocabulary.

HSK 3 | adjective | clean, free from dirt or mess

HSK 5 | noun | the sustained rise in the general price level of an economy

Master Esperanto's six-form participle system, distinguishing ongoing from completed states, and use participial nouns, adverbs, and compound tenses fluently.

HSK 1 | verb | to exchange goods for money

HSK 3 | noun / adverb | time reference word for events before a stated point

HSK 5 | noun | a public forum for discussion; an online discussion board

HSK 3 | adjective | freely giving; composed and graceful in manner

赤 (red): 7 strokes, JLPT N5. On: セキ、シャク. Kun: あか、あか-い.

HSK 4 | noun | the effect, function, or role that something plays

話 (talk, story): 13 strokes, JLPT N5. On: ワ. Kun: はな-す、はなし.

Books for learning Sindarin: grammar references, textbooks, and the primary source journals Vinyar Tengwar and Parma Eldalamberon.

Full tables for personal, reflexive, and demonstrative pronouns; the cum enclitic; and the absence of a true 3rd-person personal pronoun.

Navigate travel situations in Esperanto: transport vocabulary, buying tickets, asking for directions, and describing journeys.

Learn to link ideas, sentences, and paragraphs using coordinating and subordinating conjunctions and discourse markers for coherent, flowing Esperanto.

HSK 2 | adjective | the color black; also dark (absence of light)

HSK 3 | verb | to care about something emotionally; to mind or be bothered by something

HSK 3 | grammar pattern | conditional conjunction expressing minimum sufficient condition

HSK 5 | verb/noun | to consume goods or services; consumption

HSK 4 | noun | friend; companion

HSK 3 | grammar pattern | emphasizes time, place, manner, or agent of a completed action

南 (ナン・ナ/みなみ): south. JLPT N5 essential kanji.

分 (minute, part): 4 strokes, JLPT N5. On: ブン、フン、ブ. Kun: わ-ける、わ-かる.

HSK 4 | adjective | correct; right; accurate

Language for navigating cultural difference — expressions for cultural contrast, conflict, fusion, and the pragmatics of intercultural interaction at C1 level

文化 (ぶんか / bunka): culture. N4 level Japanese vocabulary.

HSK 4 | verb / noun | to praise; to commend; praise

HSK 4 | adjective | ahead of others in development or quality

HSK 6 | n | a main claim or point of argument in reasoning or debate

Analyzing 政治语体: the vocabulary, rhetoric, and pragmatics of Chinese political communication.

HSK 5 | verb | to become involved in a situation in order to influence its outcome

HSK 4 | adverb | in a way that is plain to see or understand

We have a football tournament involving three teams. Every game produces exactly one winner, so each played game contributes exactly one win to one of the teams. After k games have already been played, we do not know the exact number of wins of the three teams.

HSK 3 | noun | air conditioner, air conditioning unit

HSK 1 | verb | to play, to have fun, to hang out

Learn to ask for and give directions, name places in a city, and talk about transport in Esperanto.

Mastering nested relative clauses and long noun phrase chains — the syntactic backbone of advanced Chinese prose

HSK 3 | adjective/verb | fully developed in body, mind, or flavor

HSK 3 | noun | a written character, word, or one's handwriting

HSK 4 | noun | physical components of a computer or electronic device

HSK 3 | noun | skin, the outer covering of the human body

HSK 4 | noun | one's mental or emotional stance toward something

HSK 5 | noun | a formal system for supervising and ensuring accountability

HSK 5 | verb | to put into practice; to make concrete

HSK 4 | verb/noun | to have a clear understanding of something through learning or inquiry

HSK 3 | adjective | fluent, smooth — describes language production that flows without stopping

HSK 5 | noun/verb | a challenge; to challenge; to test one's limits