Karl Max set a good example. He said when one is learning a foreign language, he must use it.
卡尔·马克思作出了一个很好的榜样。他说当学习一门外语的时候必须使用它。
He carries a smoke hood but warns that if you're going to follow his example you must learn how to use it.
他在旅行中会携带一个防烟头罩，但他警告说，想像他这样，就要学会如何使用该头罩。
He must also consider the live load, the weight of all the people, cars, furniture, machines, and so on that the structure support when it is in use.
他还必须考虑到活荷载，即结构之中人、车、家具、机械设备以及在该结构投入使用时所需要承载的重量。
Unlike his radio colleague he must know the value of silence and how to use it in those moments when the pictures speak for themselves.
与他的电台同事所不同的是，他必须知道沉默的价值，并且知道当画面不言自明的时候，怎么去运用沉默（的时间长度）。
The basis of the passenger's request must be that he or she can use an inaccessible lavatory but cannot reach it from a seat without using an on-board wheelchair.
旅客提出要求的前提必须是他或她要通过机上轮椅才可以使用非无障碍卫生间。
He said some new device must be invented that would make it possible to search for, find and use new information much more quickly.
因而需要发明一些新的设备，来实现更快搜索、寻找和使用新信息。
He said some new device must be invented that would make it possible to search for, find and use new information much more quickly.
因而需要发明一些新的设备，来实现更快搜索、寻找和使用新信息。
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