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21. | conserve one's strength |
| 保存体力 |
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22. | to build up one's strength |
| 增强体力 |
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23. | many-body force |
| 多体力 |
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24. | specific body force |
| 单位体力 |
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25. | a manual worker |
| 体力劳动者 |
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26. | body force potential |
| 体力势 |
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27. | colloidal force |
| 胶体力 |
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28. | physical exertion; physical activity; physical exercise |
| 体力活动 |
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29. | three body force |
| 三体力 |
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30. | recruit one's health [strength] |
| 恢复健康 [体力] |
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