It's very quiet upstairs; they must be up to some mischief !
楼上很安静。他们一定在搞什么恶作剧。
The taxi driver reeled off a list of historic edifices they must not fail to visit.
出租车司机一口气说出了一串他们不应错过参观的历史建筑。
Wendy, who saw that they must break the joyous news more gently, had a better plan.
温迪觉得他们必须把这个令人高兴的消息更温柔地说出来，她有了一个更好的计划。
But if governments don't want a data economy controlled by a few giants, they must act soon.
但是，如果政府不希望数据经济由少数巨头控制，它们必须尽快采取行动。
For young people to use their right to vote wisely, they must have an understanding of the needs of society, and they must also learn how politics work.
要让年轻人明智地使用他们的投票权，他们必须了解社会的需要，也必须了解政治活动是如何运作的。
If Gilbert and the Philharmonic are to succeed, they must first change the relationship between America's oldest orchestra and the new audience it hopes to attract.
如果吉尔伯特和爱乐乐团想要成功，他们首先必须改变美国最古老的管弦乐团和它希望吸引的新观众之间的关系。
The man and the child, the penitent and the innocent, felt that they must kneel.
老人和孩子，忏悔者和无罪者，都感到应当跪下。
Alia knew that if the books were to be safe, they must be moved again while the city was quiet.
艾丽娅知道，如果要保证这些书的安全，就必须在城市安静的时候再把它们搬走。
They, too, have journeys they must complete.
但他们也有他们必须完成的旅程。
So, they said, they must be on the right track.
因此，他们认定自己正行进在正确的轨道上。
It is an unenviable job, but attempt it they must.
这不是份令人羡慕的差事，但他们必须努力这么做。
If we are talking about new measures, they must be effective.
如果我们要采取新的措施，就必须有效。
Ultimately, systems are not just built; they must be maintained.
归根到底，系统并不是一建立好就万事大吉了；它们必须要进行维护。
For our children to succeed, they must first believe they can succeed.
我们孩子要取得成功，他们必须首先相信自己能够成功。
While the significant recent gains are fragile, they must be sustained.
虽然最近所取得的重大进展仍很脆弱，但要加以保持。
They can, and they must, and they will meet higher standards in our time.
他们在我们的时代里能够、必须、也必将达到更高水平。
Once again they must take to the skies in their endless search for food.
再一次的，它们冲入天空，为食物和生存进行无尽的搜寻。
But labelling is not enough; the food firms know they must also offer healthier fare.
不过，标注还不够；食品公司清楚，他们还必须生产出更加健康的食品。
Sussman has only one criterion for her subjects - they must be older than 2000 years.
萨斯曼选择拍摄对象的标准只有一个——年龄必须超过2000岁。
Third, they must not undermine incentives to conserve endangered species in the wild.
第三，不能打消在野外保护濒危物种的积极性。
If galaxies are moving apart now, they must therefore have been closer together in the past.
若星系现在正远离我们，那它们过去一定比现在离我们更近。
For our beliefs to be rational they must correspond to the way the world is-they must be true.
我们的信念如果要合理的话，它们就必须符合现实世界的运行方式，即它们必须是真实的。
By creating tangible examples, users can give engineers a clear vision of what they must build.
通过创建切实的示例，用户可以让工程师清楚地了解他们必须构建什么内容。
To learn that it is not enough that they forgive one another, but they must also forgive themselves.
他们要知道，仅仅原谅别人是不够的，他们还必须要原谅自己。
To learn that it is not enough that they forgive one another, but they must also forgive themselves.
他们要知道，仅仅原谅别人是不够的，他们还必须要原谅自己。
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