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21. | tunnel Borer |
| 隧道掘进机 |
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22. | Tourist tunnel |
| 风光隧道 |
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23. | Mass Transit Railway tunnel |
| 地下铁路隧道 |
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24. | Approached the tunnel. |
| 接近隧道 |
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25. | tunnel below water course |
| 水下隧道 |
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26. | single-track bore |
| 单轨隧道 |
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27. | mountain tunnel |
| 山岭隧道 |
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28. | closure of tunnel |
| 关闭隧道 |
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29. | pressure tunnel |
| 压力隧道 |
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30. | tunnel conduction |
| 隧道导电 |
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