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| 51. | tunneling excavation |
| 隧道开挖 |
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| 52. | tunnel escape road |
| 隧道太平路 |
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| 53. | tunnel foundation |
| 隧道基础 |
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| 54. | subway lighting |
| 隧道照明设备 |
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| 55. | tunnel photodiode |
| 隧道光电二极管 |
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| 56. | tunnel ventilation shaft |
| 隧道通风井 |
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| 57. | tunnel repeater |
| 隧道转发器 |
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| 58. | syncline tunnel |
| 向斜隧道 |
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| 59. | tunnel structure |
| 隧道构筑物 |
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| 60. | Cheung Tsing Tunnel |
| 长青隧道 |
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