a technique that is often used for subway construction is the cut-and-cover method. 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.

• 隧道挖填施工法经常用于地铁建设。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。