布朗太太走了进来，告诉全班同学下星期他们必须更换教室。
Mrs. Brown came in and told the whole class they would have to change the classroom the next week.
他们说，有一天，对于现在必须开胸更换病变的脉瓣的低风险患者，这一新的过程可能是一种替换选择。
Someday, they say, the new procedure may be an alternative for the kind of lower-risk patients who now have to have their chests opened to replace diseased aortic valves.
在封井过程中，他们必须把用于在钻探过程里，保持钻井与海水压力相当的高密钻井泥更换掉：因为上方的海水的压力低于底下油气的压力。
As part of that process they had to replace the dense drilling mud, which was used to keep the well under pressure while it was drilled, with sea-water.
你必须更换这些轮胎，他们磨损的太厉害了。
You will have to replace those tyres, because they are badly worn.
他们说，他们必须挖掘该污水管道进行必要的维修和更换，而该工程将定于本周即将展开。
They said they will have to dig up a long portion of the sewer pipe to make the necessary repair and replacement.
与此同时，机主们还被要求下载一个软件来将电池电力控制在60%的水平，而且要想更换手机他们还必须重新安装所有应用软件。
In the meantime, they were required to download a program that limits the battery capacity to 60 percent and to reinstall all of applications for exchanged devices.
比赛开始时及比赛过程中运动员需要更换球拍时，必须向对方和裁判员展示他将要使用的球拍，并允许他们检查。
At the start of a match and whenever he changes his racket during a match a player shall show his opponent and the umpire the racket he is about to use and shall allow them to examinate it.
比赛开始时及比赛过程中运动员需要更换球拍时，必须向对方和裁判员展示他将要使用的球拍，并允许他们检查。
At the start of a match and whenever he changes his racket during a match a player shall show his opponent and the umpire the racket he is about to use and shall allow them to examinate it.
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