Well, maybe you'll come for lunch some Sunday,so we can really thank you for bringing Richard's bag back.
既然如此 或许哪个星期天你能来吃中饭让我们好好地感谢你送回Richard的旅行袋。
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。