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我学会“三角形的稳定性”这个与生活联系紧密的数学知识可谓来之不易。一开始上课老师问:“三角形有什么特点?”同学们说:“三个顶点,三个角,三条边。”“还有吗?”启坤同学站起
I learned that “the stability of the triangle” is inextricably linked to life’s mathematical knowledge. The beginning of the class teacher asked: “What are the characteristics of the triangle? ” Students said: “Three vertices, three corners, three sides. ” "Still?