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| 21. | How long can you stay under water? |
| 你能潜在水中多久？ |
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| 22. | (biology) growing or remaining under water. |
| （生物学）在水下成长或者呆在水下。 |
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| 23. | This pen will mark under water. |
| 这支笔可在水底做标记 |
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| 24. | He learns to breathe out under water. |
| 他学习在水下吐气。 |
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| 25. | to submerge; to navigate under water |
| 潜航 |
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| 26. | How long can you remain under water? |
| 你能在水下呆多长时间？ |
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| 27. | which could write under water, and wrote, |
| 这支笔可在水中写字，然后用笔在笔记本上写道： |
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| 28. | sink below the surface; go under water. |
| 沉没水面下；沉没水下。 |
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| 29. | The boy wanted to duck under water. |
| 这个男孩想潜入水中。 |
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| 30. | an apparatus intended for use under water. |
| 打算用于水下的装置。 |
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