Laubmannite
n. [矿]羟绿铁矿
🗣️ 情景例句
Here I am.
我在这儿！
Don't forget to write to let us know you arrived safely.
不要忘记写信回来，告诉我们你已经安全抵达。
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。