他们一定富得流油。
They must have known what their father was up to.
他们一定已经知道他们的父亲在暗地里做什么。
As they must also sprint over short distances, speed is essential.
由于他们还必须疾速短跑，因此速度是至关重要的。
They must choose between two evenly matched candidates for governor.
他们必须从两个不相上下的候选人中选出州长。
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。
Women have been brainwashed into thinking that they must go out to work in order to fulfil themselves.
妇女们被反复灌输的思想是：她们必须出去工作，才能实现自己的价值。
他们必须跑很长一段距离。
They must be hiding something.
他们一定是在遮掩什么。
They must endure wear and tear.
它们必须能够经得起磨损。
This is why they must be free.
这就是为什么他们必须是免费的。
They must be of the same size.
它们的大小必须相同。
Surely they must have a description.
他们肯定有一个说明。
他们必须吃顿饭。
They must follow some common standards.
他们必须遵循一些共同的标准。
They must be made from a rare material.
它们一定是由稀有材料制成的。
他们一定很高兴。
他们必须向下走。
They must have a definite replay, yes or no.
他们必须得到一个要么是要么非的明确回答。
They must also clean, cook and sail the ship.
他们还必须清洁、做饭和驾驶船只。
They must have confused me with my brother Jack.
他们一定把我和我弟弟杰克搞混了。
They must do maintenance for the training centre.
他们必须对培训中心进行维护。
They must immediately cease all their provocations.
他们必须停止一切挑衅。
They must have confused me with my twin brother Rod.
他们一定把我和我的孪生兄弟罗德搞混了。
This is because they must share expensive facilities.
这是因为，他们必须共享昂贵的设施。
They must stay there and wait until the searchers came.
他们必须呆在那里，等待搜寻者的到来。
They must be followed instantly to get them back again.
必须立即跟着他们，让他们回来。
"They must be swimming back or flying," the boys concluded.
“他们一定是游回来了，或者是在飞。”孩子们总结道。
Logically, one day they must: the planet is a finite place.
从逻辑上讲，总有一天他们必须这样做：因为地球是一个有限的空间。
They must commit to spending time with their older neighbours.
他们必须承诺与年长的邻居共度时光。
To qualify for the bonus, they must maintain a healthy weight.
为了有获得奖金的资格，他们必须保持健康的体重。
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