Lactamine
丙氨酸
🗣️ 情景例句
Sorry, but he is out at the moment.
抱歉，他现在出去了？
I would like to go to school, Do you want to go, too?
我要去学校，你是不是也要去？
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。