这种压力必须加以控制，我们让泥桨顺着钻杆向下循环，用这种方法来控制压力。
This pressure must be under control, and we control it by means of the mud which we circulate down the drill pipe.
这种压力必须加以控制，我们让泥桨顺着钻杆向下循环，用这种方法来控制压力。 。
This pressure must be under control, and we control it by means of the mud which wecirculate down the drill pipe.
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