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| 31. | tunnel ventilation shaft |
| 隧道通风井 |
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| 32. | tunnel construction |
| 隧道建筑 |
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| 33. | tunnel escape road |
| 隧道太平路 |
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| 34. | syncline tunnel |
| 向斜隧道 |
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| 35. | tunnel foundation |
| 隧道基础 |
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| 36. | tunnel structure |
| 隧道构筑物 |
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| 37. | tunnel photodiode |
| 隧道光电二极管 |
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| 38. | tunneling excavation |
| 隧道开挖 |
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| 39. | tunnel repeater |
| 隧道转发器 |
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| 40. | subway lighting |
| 隧道照明设备 |
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