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21. | shield arc welding |
| 封闭电弧焊 |
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22. | closed container |
| 封闭容器 |
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23. | closed economy model |
| 封闭经济模式 |
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24. | enclosed lamp sign |
| 封闭灯号 |
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25. | closed in spaces |
| 封闭舱室 |
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26. | shutting-off water |
| 封闭水层 |
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27. | closing membrane |
| 封闭膜 |
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28. | enclosed environment |
| 封闭环境 |
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29. | sandstone seals |
| 砂岩封闭 |
|
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30. | suppressor pulse |
| 封闭脉冲 |
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