B-unit
变数部件，变址部件
🧩 词语组成解析
unit
['ju:nit]
n. 单位，单元;装置;个体;[数]单位数;
🗣️ 情景例句
Did she mention when she would arrive?
她说过什么时候到吗？
Isn't that great?
你不是很好吗？
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。