If the glass were kept hot enough, it would flow over the molten tin until the top surface was also flat, horizontal and perfectly parallel to the bottom surface.
如果玻璃保持足够的温度，它就会在熔化的锡中流动，直到顶部表面也变得平整、水平，与底部表面完全平行。
When pouring molten glass onto the molten tin, the underside of the glass would also be perfectly flat.
当把玻璃液倒在锡液上时，玻璃的底面也会变得完全平整。
IN TIN of digital elevation model constructed from contours, flat areas which are made up of flat triangles can not reflect the real shape of the surface, so that they need be corrected properly.
在基于等高线建立的数字高程模型TIN中，由平坦三角形连接成的平坦区域不能真实地反映地表的真实形状，需要进行适当地修正。
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