每个学院都会选择自己的学生，学生必须达到大学规定的最低入学要求。

Individual colleges choose their own students who have to meet the minimum entrance requirements set by the university.

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相比之下，奥巴马总统上周宣布，到2016年，每家汽车制造商必须达到每加仑汽油行驶35.5英里的企业平均水平。

By comparison, President Obama announced last week that each automaker will be required to reach a corporate average of 35.5 miles per gallon by 2016.

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这是我们必须达到的目标。

That is the goal that must be achieved.

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You have to be of an age to be a fighting man. It's not necessarily defined for us.

必须达到最低年龄的要求,才能参军,不像我们现在这样

耶鲁公开课 - 古希腊历史简介课程节选

Here, too, gets a little ugly and this is why I tend not to like this construct, at least in C, but sometimes it's necessary or it's the simplest way to achieve this goal.

这里也有点难看的，这也是为什么我,不太喜欢这个结构，至少在C语言中，但是有时它是必须的,或者它是达到目标最简单的方法。

哈佛公开课 - 计算机科学课程节选