Hance
n. 拱腰, 椭圆拱脚尖最短半径的弧
🗣️ 情景例句
but I'm restless.
但我闲不住。
I really don't know.
我真不知道。
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。