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何年生， なんねんせい

1. what grade (in school)

tbd

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君， 公， きみ

1. you, buddy, pal 2. monarch, ruler, sovereign, (one's) master 3. he, she

你，伙计，老兄；君主，统治者，主权者，(某人的)主人；他，她

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は

1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis

指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调

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