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Why do humans smile? This is a very difficult question to answer.
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Vocabulary list

naze
adverb
  1. why; how
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ningen
noun
  1. human being; human; person; man; mankind; humankind
  2. character (of a person)
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ha
particle
  1. topic marker particle (pronounced わ in modern Japanese)
  2. indicates contrast with another option (stated or unstated)
  3. adds emphasis
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warau
godan verb, intransitive verb
  1. to laugh
  2. to smile
  3. to sneer; to ridicule (esp. 嗤う)
  4. to be dumbfounded; to be flabbergasted (as 笑ってしまう or 笑っちゃう)
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noka
particle
  1. endorsing and questioning the preceding statement (sentence ending particle)
  2. lamenting reflections on the preceding statement (sentence ending particle)
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no
particle
  1. indicates possessive (occasionally ん, orig. written 乃 or 之)
  2. nominalizes verbs and adjectives
  3. substitutes for "ga" in subordinate phrases
  4. (at sentence-end, falling tone) indicates a confident conclusion (often ん)
  5. (at sentence-end) indicates emotional emphasis
  6. (at sentence-end, rising tone) indicates question
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ka
particle
  1. yes?; no?; isn't it?; is it? (used at sentence-end; indicates a question (sometimes rhetorical))
  2. or; whether or not (after each alternative)
  3. some- (e.g. something, someone) (after an interrogative)
  4. hmm; huh (indicates doubt, uncertainty, etc.; sometimes after other particles)
prefix
  1. very (emphatic prefix; usu. before an adjective)
suffix
  1. -al; -ial; -ic; -ical; -ish; -y (suffix forming adjectives or adverbs; after an indeclinable word)
adverb
  1. in that way
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toiu
expression
  1. called; named; that says; that
  2. as many as; as much as (after a quantity)
  3. all ...; every single ... (as ...という...)
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mondai
noun
  1. question (e.g. on a test); problem
  2. problem (e.g. societal, political); question; issue; subject (e.g. of research); case; matter
  3. question (i.e. doubt)
  4. public discussion; controversy
  5. trouble; problem; inconvenience; difficulty
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koreha
expression
  1. as for this
interjection
  1. hey there; see here; I say (expression of surprise when one encounters something unexpected)
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kore
pronoun
  1. this; this one (indicating an item near the speaker, the action of the speaker, or the current topic)
  2. this person (usu. indicating someone in one's in-group)
  3. now; this point (in time) (as これから, これまで, etc.)
  4. here
adverb
  1. used to stress the subject of a sentence
pronoun
  1. I; me
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ha
particle
  1. topic marker particle (pronounced わ in modern Japanese)
  2. indicates contrast with another option (stated or unstated)
  3. adds emphasis
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nakanaka
adverb, na adjective
  1. very; considerably; easily; readily; fairly; quite; highly; rather
adverb
  1. by no means; not readily (with a verb in the negative)
noun
  1. middle; half-way point
no adjective
  1. excellent; wonderful; very good
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muzukashii
i adjective
  1. difficult; hard; troublesome; complicated; serious (disease, problem, etc.)
  2. impossible; unfeasible (euphemistic)
  3. fussy; particular; fastidious; hard to please; displeased
  4. gloomy; glum; sullen; serious (look)
  5. dirty; unclean; filthy; detestable
  6. unpleasant; uncomfortable; creepy; spooky
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mondai
noun
  1. question (e.g. on a test); problem
  2. problem (e.g. societal, political); question; issue; subject (e.g. of research); case; matter
  3. question (i.e. doubt)
  4. public discussion; controversy
  5. trouble; problem; inconvenience; difficulty
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dearu

Polite Present Indicative Form

dearimasu
copula, godan verb (irregular)
  1. be; is
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dearimasu
expression
  1. be; is (formal or literary polite copula)
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de
particle
  1. at; in (indicates location of action; にて is the formal literary form)
  2. at; when (indicates time of action)
  3. by; with (indicates means of action)
conjunction
  1. and then; so
auxiliary
  1. and; then (indicates continuing action; alternative form of 〜て used for some verb types)
particle
  1. let me tell you; don't you know (at sentence-end; indicates certainty, emphasis, etc.)
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aru

Polite Present Indicative Form

arimasu
godan verb (irregular), intransitive verb
  1. to be; to exist; to live (usu. of inanimate objects)
  2. to have
  3. to be located
  4. to be equipped with
  5. to happen; to come about
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