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21. | It is necessary that the children should obey you. |
| 孩子们必须听你的话。 |
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22. | It is necessary to make a distinction between right and wrong. |
| 必须分清是非。 |
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23. | Careful observation of the infusion site is necessary. |
| 必须仔细观察输液部位。 |
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24. | All necessary materials should be on hand. |
| 一切必须的材料应准备就绪。 |
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25. | 'It is necessary for us to know everything.' |
| “我们必须掌握一切。” |
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26. | It is necessary for the children to obey you. |
| 孩子们必须服从你。 |
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27. | Attendance at the lectures is necessary. |
| 这些讲座是必须参加的。 |
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28. | It is necessary to end this state of affairs. |
| 必须结束这一局面。 |
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29. | Complete sth unpleasant but necessary |
| 完成或结束必须做的讨厌事 |
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30. | Great care is necessary in doing it. |
| 做这件事必须非常小心。 |
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