This reeling out and in of the drilling line causes the traveling block, and whatever may be hanging underneath it, to be lowered into or raised out of the wellbore.
这种钢丝绳沿滚筒松开和缠绕引起游动滑车从井眼内下降或上升，无论游动滑车下面悬挂的是什么东西。
2
The hanging wall block is relatively little disturbed, but the ore zone beneath bears abundant evidence of tangential movements .
上盘岩块相对地变动不大，而其下的矿石带却具有许多切线运动的证据。
3
A hanging at each side of a stage directly behind the proscenium that serves to block the wing area and sidelights from the audience.