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21. | alternate with sth/alternate between A and B :occur in turn;consist of two different things in turn |
| 轮流;交替 |
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22. | heel-and-toe watches |
| 轮流值班 |
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23. | turn and turn about |
| 依次|轮流 |
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24. | Take turns feeding each other. |
| 相互轮流喂食。 |
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25. | duty-roster system |
| 轮流值班办法 |
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26. | The sentries alternated their watch. |
| 哨兵轮流站岗。 |
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27. | To change in turn |
| 替换轮流 |
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28. | They took turns in asking questions. |
| 他们轮流提问。 |
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29. | rotate men in office |
| 职员轮流值班 |
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30. | provide for rotation of the chairmanship |
| 轮流担任主席 |
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