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。
Finally and mysteriously, the plane disappeared without trace.
最后，飞机神秘地消失得无影无踪了。
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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