教师必须自由地以他们自己的方式教学——课程应该足够灵活，这样他们就可以利用他们的个人才能来实现课程目标。

The teachers must be free to teach in their own way — the curriculum should be flexible enough so that they can use their individual talents to achieve the goals of the course.

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表示复数的s不是自由语素，必须附着于名词。

The plural 's' is not a free form, as it must always be attached to a noun.

《牛津词典》

渥太华和华盛顿必须在自由贸易流通和司法安全事务之间找到一个微妙的平衡。

Ottawa and Washington have to find a delicate balance between the free flow of commerce and legitimate security concerns.

《柯林斯英汉双解大词典》

He writes home, "I do not intend to shirk now that there is really something to fight for; I mean freedom.

他在家书中道,"我不打算逃避,我必须为之一战,为自由而战

耶鲁公开课 - 美国内战与重建课程节选

I want to just go over the requirements of the course that really are required, not the optional piece, just so that you understand what my purpose is pedagogically.

我只想跟大家回顾一下,这门课程的必须要求，并非可以自由选择的,这样你们会理解我的目的何在。

耶鲁公开课 - 1945年后的美国小说课程节选

We must wonder whether the power of modern weapons will allow it and the world to survive at such a price.

我们必须质疑现代武器的力量能否,维系自由和这个世界的存在

耶鲁公开课 - 古希腊历史简介课程节选