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| 41. | Construct a tunnel |
| 建造隧道 |
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| 42. | excavating gear |
| 挖掘装置 |
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| 43. | excavation bottom |
| 挖掘基底 |
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| 44. | went through the tunnel. |
| 穿过隧道 |
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| 45. | footing excavation |
| 基础挖掘 |
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| 46. | municipal-service tunnel |
| 市政隧道 |
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| 47. | tap production potential |
| 挖掘生产潜力 |
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| 48. | Pedestrian tunnel |
| 行人隧道 |
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| 49. | tunnel survey |
| 隧道测量 |
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| 50. | Blast away a tunnel |
| 炸开隧道 |
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