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21. | bridge deck renewal |
| 桥面更换 |
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22. | replacement of meter |
| 更换水表 |
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23. | to renew ones liBrary ticket |
| 更换图书卡 |
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24. | exchange function |
| 更换功能 |
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25. | tank replacement |
| 更换油罐 |
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26. | changing monitor |
| 更换监督程序 |
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27. | track replacement |
| 线路更换 |
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28. | buffer exchange |
| 缓冲液更换 |
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29. | change of dominance |
| 显性更换 |
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30. | variety renovation |
| 品种更换 |
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