A massive oak claims its ground for 200 years or more, outcompeting all other would-be canopy trees by casting a dense shade and drawing up any free water in the soil.
200年或更久的时间里，一棵巨大的橡树占据了它的土地，投下浓密的树荫，吸收土壤中所有自由水分，打败了所有其他可能成为树冠的树木。
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 this paper, we acguired a way of seeking shade and shadow of spheric surface in orthographic axonometric projection drawing by means of changing axonometric projection.
文章论述了如何用变换轴测投影的方法求圆球正轴测图的阴影。
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