It is then circulated back along the exterior of the tunneling machine to help cool the vitrified rock as the tunneling machine forces its way forward.
然后，当隧道钻机还在强行向前钻进时，锂就回过来消散在隧道钻机的表面来帮助冷却玻璃化了的岩石。
During tunneling, there are back and forth displacements at pile top along the direction in which the tunnel is pushed forward.
开挖过程中桩顶出现沿隧道推进方向的往复位移；
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