Railways
n. 铁路, 铁道( railway的复数形式 ); 铁路系统
🗣️ 情景例句
How much are the dues?
会费多少？
What a coincidence!
真巧！
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。