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。
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。
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 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。
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。
They must both be coming FROM somewhere, and going TO somewhere.
它们一定是从什么地方来，又要到什么地方去。
They must ensure that the plot would develop in a logical manner.
他们必须确保情节以合乎逻辑的方式发展。
Even if bacteria did arrive on Earth from Mars, they must have died out.
即使细菌真的从火星来到地球，它们也一定已经灭绝了。
They must develop processes that satisfy each goal and specific practice.
他们必须开发满足每个目标和具体实践的过程。
They are sent to school, and whether they want to or not, they must study.
他们被送到学校，不管他们想不想，他们必须学习。
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