打好网球的重要原则是眼要紧盯着球。

The golden rule in tennis is to keep your eye on the ball.

《牛津词典》

尊重是足球的一个重要原则。

Respect is a key principle of football.

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第一个重要原则是公司每一笔财务交易都需要被记录下来。

The first important principal is every financial transaction of a company needs to be recorded.

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And then, I want to turn to objections to behaviorism but these three principles are powerful and very interesting.

之后，我还想讲讲对行为主义的反对,但这三个原则是非常重要的,也是很有意思的。

耶鲁公开课 - 心理学导论课程节选

Well, we should be shocked, and I think beyond that we have every right to feel a little bit betrayed, because Milton quite simply has -- and he's doing this deliberately -he has just violated an important law.

我们应该非常吃惊，除了这点以外,我们有着充分的权利感到有点被背叛的感觉，因为弥尔顿只是-并且他非常刻意,他只是违背了一项重要的原则。

耶鲁公开课 - 弥尔顿课程节选

There's a very important principle that finally comes out here, it is that you always want to reduce the variance of your portfolio as much as you can.

现在这里有一个非常重要的原则，即你总是想要降低你投资组合的方差,降得越低越好。

耶鲁公开课 - 金融市场课程节选