To ensure the existence of boundary sides and faces, local tetrahedralization method is adopted, needing add no node into the origin surface triangulations.

采用局部剖分的方法来保证边界的完整性，不需要添加新的节点到原始表面三角形中。

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Its latest pictures from just a few hundred kilometres above the surface are expected to provide important new clues to the origin of the planet and its geological history.

最近在距离水星表面几百千米的空中拍摄的一组照片很可能会为行星的起源以及水星的地貌历史提供新线索。

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The origin of the color differences is not yet understood, but may be caused by differences in the surface composition between the two terrains.

产生颜色差异的原因还不清楚，有可能是两种地形表面成分的差异造成的。

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These data will provide invaluable information about Antarctic atmospheric dynamics, of the origin of water vapour over the oceans and how it is ultimately deposited as snow on the surface of the ice sheet.

BBC: Viewpoint: The last great polar challenge