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| 41. | tunnel Borer |
| 隧道掘进机 |
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| 42. | Approached the tunnel. |
| 接近隧道 |
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| 43. | closure of tunnel |
| 关闭隧道 |
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| 44. | tunnel conduction |
| 隧道导电 |
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| 45. | mountain tunnel |
| 山岭隧道 |
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| 46. | Mass Transit Railway tunnel |
| 地下铁路隧道 |
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| 47. | pressure tunnel |
| 压力隧道 |
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| 48. | tunnel below water course |
| 水下隧道 |
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| 49. | single-track bore |
| 单轨隧道 |
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| 50. | tunnel construction |
| 隧道建筑 |
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