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21. | replacement of meter |
| 更换水表 |
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22. | oil seal replacement |
| 油封更换 |
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23. | alternate coding |
| 更换编码 |
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24. | tank replacement |
| 更换油罐 |
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25. | changing volume |
| 更换卷 |
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26. | sleeper replacement |
| 轨枕更换 |
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27. | to switch | to switch players |
| 更换守卫 |
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28. | to renew ones liBrary ticket |
| 更换图书卡 |
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29. | replace samples |
| 更换样品 |
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30. | track replacement |
| 线路更换 |
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