Traditional Drawing Geometry teaching depends on compass, ruler and slide show etc. Learner finds it abstract.

传统的《画法几何》教学方法凭借的是圆规、尺子和幻灯等教具，抽象、枯燥是学习者的共同感受。

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Moved by a combination of reason and fear, Hobbes believed, human beings will contract with each other to create a sovereign - an absolute ruler who will prevent any slide into anarchy.

BBC: A Point of View: A time when violence is normal