放学以前，我们必须完成这项工作。

Before school is over, we must finish the work.

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项目为我们的工作设置环境；而我们必须完成这个项目。

Projects set the context for our work; we then must do work to complete the project.

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在插件内容向导页面中，我们必须完成一张表单才能使插件与 Eclipse 兼容。

On the plug-in content wizard page, we must complete a form to make our plug-in compliant with Eclipse.

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A test suite is small enough so that we can test it in a reasonable amount of time.

测试集必须小到我们可以在一个,合理的时间内完成他，但是必须大到。

麻省理工公开课 - 计算机科学及编程导论课程节选

And that's our obligation to send them to war only when we have to, and only when we know they can actually achieve their mission is a key difference between what I advocate and what the neo-cons advocate.

我们有义务,在必须的时候，送他们上战场，我们必须确保,他们一旦奔赴战场就能完成使命,这是重大的不同,我和新型保守派主张的不同之处主要在此。

普林斯顿公开课 - 国际座谈会课程节选