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| 21. | safety cautions |
| 安全事项;安全注意事项 |
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| 22. | And imported water hyacinth plants are choking some parts of the Yangtze River and the Pearl River. |
| 而进口的水葫芦正在淤塞长江和珠江的部分河段。 |
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| 23. | Strong dikes have been built along this part of the river to fend back floods. |
| 沿这部分河段修筑了坚固的大堤以挡住洪水。 |
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| 24. | safety requirements |
| 安全要求; 安全规格 |
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| 25. | 1998年8月至9月＜有化美国国家安全：美国与俄罗斯间的浓缩铀协定岌岌可危＞今日武器管制》，武器管制协会。 |
| Neff, Thomas L." Privatizing U. S. National Security: The U. S.- Russian HEU Deal at Risk." Arms Control Today. Arms Control Association, August/ September1998. |
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| 26. | safety precautions;safety rules. |
| 安全预防措施；安全条例 |
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| 27. | To secure or stow safely. |
| 使安全，安全装载 |
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| 28. | safe working load [SWL] |
| 安全负载；安全负重 |
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| 29. | safety regulations |
| 安全规程|安全守则 |
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| 30. | radiological safety |
| 放射安全|辐射安全 |
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