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講師， こうし

1. speaker, lecturer 2. lecturer (at a university or college), instructor 3. part-time teacher 4. tutor (at a cram school)

演讲人、讲师；讲师

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本題， ほんだい

1. main topic, main subject, main issue, main question 2. this subject

tbd

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脱線， だっせん

1. derailment 2. digression, deviation

脱轨；离题，偏离

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しまう， 仕舞う， 終う， 了う， 蔵う

1. to finish, to stop, to end, to put an end to, to bring to a close 2. to close (a business, etc.), to close down, to shut down, to shut up 3. to put away, to put back, to keep, to store 4. to do completely, to finish 5. to do accidentally, to do wi...

完成，做完；关闭，停(业)；完成；不小心(做了……)

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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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から

1. from (e.g. time, place, numerical quantity), since 2. from (originator), by 3. because, since 4. out of (constituent, part) 5. through (e.g. window, vestibule) 6. after, since 7. expresses sympathy or warning

从，自……；因为；被，用于……

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する， 為る

1. to do, to carry out, to perform 2. to cause to become, to make (into), to turn (into) 3. to serve as, to act as, to work as 4. to wear (clothes, a facial expression, etc.) 5. to judge as being, to view as being, to think of as, to treat as, to use...

做，作，干，执行

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