Plurallin
多色菌素
🗣️ 情景例句
Thank you. I will be there on time.
谢谢你，我会准时到的。
I often go to the office in the morning.
我常常在早上去办公室。
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。