Hardens
v. （使）变硬( harden的第三人称单数 ); （使）坚固; （使）硬化; （使）变得坚强
🗣️ 情景例句
She is giving me piano lessons in exchange for her English classes.
我教她英语，她教我弹钢琴。
Where love is there is faith.
有爱情就有忠诚。
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。