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1·There must be a way round the problem.

这个问题一定有办法解决。《牛津词典》

2·The study says there must be a complete overhaul of air traffic control systems.

研究称必须对航空交通管理系统进行彻底的改革。《柯林斯英汉双解大词典》

3·It makes them feel like there must be something wrong with them.

它让他们觉得自己一定有什么问题。

4·In 2009, Martine Postma from the Netherlands decided there must be a better way.

2009年，来自荷兰的马丁·波斯马断定一定有更好的办法。

5·There must be a door somewhere.

某处一定有一扇门。

6·There must be some water there.

那里一定有水。

7·There must be something wrong with it.

它一定是出了什么问题。

8·There must be something like a trapdoor in the dungeon.

地牢里一定会有活板门之类的东西。

9·In that cave, he said to himself, there must be a fire.

“在那个洞里，”他自言自语道，“一定有火。”

10·After he went into his room, the owner said to his wife, Look at his bag, there must be much money in it.

当走进自己的房间时，店主对妻子说：“看看他的包，里面一定有很多钱。”