Quadriad
n. 四个一组(或一套、一系列)
🗣️ 情景例句
It all sounded so easy
一切听起来都那么容易。
I don't like the rush of the city.
我不喜欢纷繁忙碌的城市生活。
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。