实现这些目标从理论上说比较容易，但在实践上却相当困难。

Achieving these goals is relatively easy in theory, yet quite difficult in practice.

《柯林斯英汉双解大词典》

普雷蒂教授认为，对许多农民来说，有机农业在思想和实践上是太大的飞跃了。

Professor Pretty feels that organic farming would be too big a jump in thinking and in practices for many farmers.

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但在实践上，该裁定的影响还无可得知。

But the practical impact of the decision is unclear.

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I have a final question for you: do you feel that Princeton university is on the right trajectory in answering the question of just university?

我再问你们最后一个问题，你们认为,普林斯顿大学是否在正确的轨道上发展么？,我指的是在公正的实践这一方面？

普林斯顿公开课 - 人性课程节选

That is a maximum If you are sharing your time and energy during this period on Tuesday afternoons, or the arch-field don't work so think carefully about that.

让大家充分发挥自己的能力,如果每周二下午这段时间,你都有时间，精力也很充沛，就可以来上这门课，不过这样你就没时间参加实践活动了,所以请仔细考虑吧。

麻省理工公开课 - 电影哲学课程节选

The trouble with the etymology of theory and the way in which the word has been used traditionally is that sometimes it actually means practice, and then at other historical periods it means something very different from practice, something typically from which practice is derived.

理论这个词在词源,和传统的使用方法上的复杂之处在于,它有时候指的是实践，但在特定的历史时期,它指的是和实践非常不同的东西，也就是实践产生的依据。

耶鲁公开课 - 文学理论导论课程节选