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| 隧道掘进; 隧道作业 | |||
| 隧道掘进作业; 隧道掘进开挖 | |||
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| 隧道建造; 隧道掘进 | |||
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tunnelling operation : 9 phrases in 5 subjects |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 2 |
| Surgery | 1 |
| Technology | 4 |
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