Berdan
[人名] 伯丹
🗣️ 情景例句
It's us, Susan.
是我们， Susan。
It's earier to run down the hill than go up.
下山容易上山难。
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。