After that they gave our teachers very professional reviews and guidance, and had a lively discussion about "how to improve classroom efficiency."
课后，专家对课做了点评和专业的指导，并与老师们一起就“如何提高课堂效率”进行了热烈探讨。
Preview can make us have psychological preparation, can help us improve classroom efficiency.
预习可以使我们有心理准备，可以帮助我们提高课堂效率。
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