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忘れる， わすれる

1. to forget, to leave carelessly, to be forgetful of, to forget about, to forget (an article)

忘记；随意丢弃；疏忽；忽略；不再提及(某事)；遗忘了(某物品)

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手紙を出す， てがみをだす

1. to mail a letter

tbd

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なければならない， なければなりません， なければいけない

1. have to do, must, should, ought to

必须，应该

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に

1. at (place, time), in, on, during 2. to (direction, state), toward, into 3. for (purpose) 4. because of (reason), for, with 5. by, from 6. as (i.e. in the role of) 7. per, in, for, a (e.g. "once a month") 8. and, in addition to 9. if, although

tbd

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