At the end of the class, we'll invite someone to sum up the lesson.
本课结束之时，我们要请同学总结本课内容。
We can sum up the main point of the lesson in three sentences.
我们可以用三句话来概括本课要点。
Sum up the main points of the lesson in three sentences.
用三句话概括本课的要点。
We should sum up experience, draw the lesson .
我们应当从中总结经验，吸取教训。
First we shall ask each other questions, then one student will sum up the lesson.
我们先相互提问题，然后请一位同学总结课文。
Let ss sum up the whole lesson.
让同学们自己总结本节课所学。
Sum up historical experience, take the last as a lesson, and serve the present.
总结历史经验，以古鉴今，为现实服务。
We can sum up the lesson from failure.
我们可以总结失败的教训。
We can sum up the lesson from failure.
我们可以总结失败的教训。
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