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21. | That isn't necessary. |
| 这倒不必。 |
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22. | necessary being |
| 必然存在 |
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23. | necessary precautions |
| 必要的预防 |
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24. | [if necessary] |
| 必要时 |
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25. | necessary preliminary |
| 必要的初步行动 |
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26. | Courage was necessary; |
| 她非得有毅力不行; |
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27. | necessary product |
| 必要产品 |
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28. | Install necessary conduit. |
| 安装必要的导管。 |
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29. | Readjust as necessary. |
| 视需要重新调整。 |
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30. | be absolutely necessary |
| 绝对必要 |
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