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Many houses that are standing are still wrecked and must be torn down.

VOA: special.2010.01.22

But it's a good story, Joule decided that there must be a direct relationship between work and heat.

所以说，这只是一个不错的故事而已，焦耳认为功和热之间,一定具有某种直接的联系。

麻省理工公开课 - 热力学与动力学课程节选

For example, if you are running behind schedule and you really must be moving to your next appointment,

例如，如果你已经比计划的时间晚了，不得不马上赶赴下一场约会的时候，

have to 课堂 - SpeakingMax英语口语达人

With further mutations, they said MERS "might become increasingly transmissible" and must be continuously assessed.

NPR: To Stop MERS, Longer Quarantines May Be Necessary

In fact, the economy and the society are one and must be analyzed as such.

FORBES: America in Danger of Collapse?

Women's contributions, skills and experience are equal to men's and must be rewarded accordingly.

BBC: Gender pay gap 'still widening'