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| 坑道工程; 开槽工程; 壕坑工程 | |||
| 挖沟作业; 挖沟工作; 挖沟工程 | |||
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| 挖壕; 挖沟 | |||
| trench works: 1 phrase in 1 subject |
| Technology | 1 |
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