Get some lessons from mistakes others made, this is much cheaper and less pain than you get lesson from your mistakes.

从他人的错误中吸取教训。这比你从自己的错误中吸取教训要廉价得多，痛苦也少得多。

youdao

After the first month, you should be able to get away with one lesson a week.

第一个月之后，每周上一次课就可以了。

《牛津词典》

In her lesson she could never get her letters straight.

在她的课上，她总是把字母搞混。

youdao

The main lesson I want to get out of this for today, is a simpler lesson.

今天我们主要研究简单博弈

耶鲁公开课 - 博弈论课程节选

Let's get on with the lesson.

好，现在我们继续上课。

麻省理工公开课 - 固态化学导论课程节选

So the main lesson I want you to get from this is that not only did it matter that you need to put yourself in other people's shoes and think about what their payoffs are.

从中我们得出的主要结论是,不仅你要,站在别人的立场上,思考别人的收益是什么样的

耶鲁公开课 - 博弈论课程节选

The children also get a lesson in two of the three Rs (reduce, reuse, recycle).

CNN: Envisioning a world without garbage

"You won't get a history lesson - you'll get a running documentary as each day unfolds, " she wrote in the introduction to her site.

BBC: Zimbabwe's online campaign

It was a privilege to meet Doudou (and even get a personal lesson in drumming), wonderful to see traditional music get a contemporary twist, and eye-opening to see West African artists reaching out to the rest of the world.

CNN: Beat goes on for Senegal's octogenarian master drummer