本文基于对网络教学相关教育理论、方法的研究，开发了工程制图模型虚拟实验系统。
This paper is based on research of some related educational theories methods about the network education. And it develops the Virtual Model Experimental System based on Web of Engineering Graphics.
因此，一些学者认为，欧洲大陆一定是由古人发现并绘制的，古人绘制的地图被认为是欧洲制图者的模型。
Some scholars, therefore, argue that the continent must have been discovered and mapped by the ancients, whose maps are known to have served as models for the European cartographers.
理论物理学家将不得不回到在制图板前，用标准模型寻找其他可以解决问题的方法。
Theoretical physicists will have to go back to the drawing board and find an alternative way to solve the problems with the standard model.
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