Workers excavate a trench, inside of which the lining for the tunnel is built. It is then covered over with the earth or other fill that was originally removed.
工人们开挖一条壕沟，在沟内砌好隧道的衬砌，然后用土覆盖，或用最初挖出的土石方回填。
To create a one metre wide path you need to excavate a one metre wide trench.
要建一条一米宽的小路，你需要开凿一条一米宽的深沟。
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