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。
In the course of drawing process, the process interference and defect take place because of the difference between the centerline of concave die and the trace of moving direction.
结晶器铜管在引仲加工过程中，由于凹模中心线与机床运动方向轨迹线不同，造成加工干涉和产品缺陷。
Please wait a minute before drawing conclusion. Let us trace far back into a 1960's Olympic.
但在下结论前请等一下，让我们再回溯到更远的60年代的一届奥运会。
Please wait a minute before drawing conclusion. Let us trace far back into a 1960's Olympic.
但在下结论前请等一下，让我们再回溯到更远的60年代的一届奥运会。
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