As the machine advances, more tunnel liner is pushed from the entrance.
因此,设备的前进速度是由入口处管道顶进速度决定的。
词典释义:
隧道衬砌
As the machine advances, more tunnel liner is pushed from the entrance.
因此,设备的前进速度是由入口处管道顶进速度决定的。
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