This paper presents a new method of drawing perspective shade and shadow in parallel rays, which makes use of planetrace 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。
2
Finally and mysteriously, the plane disappeared without trace.
最后，飞机神秘地消失得无影无踪了。
3
Occasionally a plane from far and near, slowly overhead, in the end, leaving only a trace, when the clouds slowly moving to the deep imprint, and the twinkling of an eye, trace, fleeting.