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夜更かし， 夜更し， 夜ふかし， よふかし

1. staying up late, keeping late hours, sitting up late at night, nighthawk

tbd

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いけない

1. bad, wrong, naughty 2. must not (do, be), should not, ought not to 3. useless, no good, bad 4. hopeless, beyond hope 5. unfortunate, a shame, a pity 6. unable to drink (alcohol) 7. so as not to ..., so that ... (won't), in case ..., for fear that ...

以免……，以免……，以防万一……，担心……，唯恐……

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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

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