摘要
明确工程图学中的“投影”就是指所表达“物体轮廓之图形”或“物体轮廓透射到平面上的影子”,使初学者在入门之初就能对投影概念有比较全面、清晰的认识,有利于教学的顺利开展。
The “projection” in engineering drawing means the figure of the object's outline,or the reflection of the object's outline transmissed on the plane.If the beginner can understand this concept comprehensively and clearly, the teaching is easy to develop.
关键词
投影
物体轮廓
图形
projection
an object outline
figure
