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| 21. | safe drinking water |
| 安全饮水 |
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| 22. | safe and easy. |
| 安全、简便。 |
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| 23. | safe bearing capacity |
| 安全承载力 |
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| 24. | fail safe operation |
| 安全运行 |
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| 25. | safe bearing load |
| 安全承载 |
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| 26. | safe working stress |
| 安全应力 |
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| 27. | safe heat transfer |
| 安全传热 |
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| 28. | safe and simple |
| 安全、简便 |
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| 29. | safe sex practices |
| 安全性行为 |
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| 30. | The safe load |
| 安全负荷 |
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