To give better advice on teaching, futher discussion, is made on how to simplify the double integral operation with symmetry, precisely and effectively.
为更好地指导教学，文章还对如何准确、有效地利用对称性简化二重积分的计算作了进一步的探讨。
This essay is to deal with how to make a better use of class discussion so as to make it play an important role in the teaching.
本文对如何较好地综合运用课堂讨论的几种形式加以探讨，使其在教学中发挥重要的作用。
Validity is the ultimate pursuance of the Classroom Teaching with Discussion. And there are two factors to affect the validity: one is the background of teaching; the other is the course of teaching.
研究性学习下课堂教学的终极追求是课堂教学的有效性，而影响有效教学的因素既有教学的背景性因素，也有教学的过程性因素。
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