This paper presents a new method of drawing perspective shade and shadow in parallel rays, which makes use of plane trace and geometrical drawing method.
探讨了一种利用平面迹线和几何作图法，作无灭光线下透视阴影的新方法。
When the point moves along the plane curve , the trace curve of the point is called the evolute of the curve , denoted by, and is called the involute of the curve .
当点沿曲线移动时，相应的曲率中心的轨迹曲线称为曲线的渐屈线，而曲线称为曲线的渐伸线。
Several previously unknown crash sites have been spotted in the mountainous region, but there has been no trace of the 63-year-old millionaire's plane.
搜救人员在这处山区发现了几个以前不为人知的坠机地点，但是这位63岁百万富翁所驾驶的飞机仍然无影无踪。
Several previously unknown crash sites have been spotted in the mountainous region, but there has been no trace of the 63-year-old millionaire's plane.
搜救人员在这处山区发现了几个以前不为人知的坠机地点，但是这位63岁百万富翁所驾驶的飞机仍然无影无踪。
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