Lesson #4_第四课_ #4DRAWING CYLINDRICAL OBJECTS_绘制圆柱形状物体 Drawing Curved Lines_绘制弯曲的线 Observing Cylindrical Forms_观察圆柱体形的构成 ..
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Drawing curved lines in Corona, during a drag gesture?
在科罗娜啤酒绘制曲线，拖动手势中？
A vector drawing is like a pencil drawing where you take a pencil from one point to another and connect the points with straight lines, curved lines, rectangles, and ellipses.
矢量作图更像是用铅笔画画，先拿铅笔确定一些点，然后用直线、曲线、方框和椭圆框连接这些点。
In engineering drawing the intersectional lines which are formed by spatially intercropping of some curved surfaces have very complicated shape and unthinkable tridimensional model.
在工程制图中，某些曲面立体相贯时的相贯线的形状非常复杂，以及一些立体模型难以想象。
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