Slocker
落水洞
🗣️ 情景例句
Do you happen to know...
你是否碰巧知道…
A growing youth has a wolf in his belly.
青年成长时，食量大如狼。
and we control it by means of the mud which we circulate down the drill pipe.
我们让泥浆顺着钻杆向下循环，用这种方法来控制压力。