The most commonly used surface patches are the triangle and the quadrangle surface patch.

目前最常用的曲面片是三边曲面片和四边曲面片。

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Based on a point line patch hierarchical data structure, three dimensional complex geometries are described by several typical kinds of surface patches.

按点-线-面的层次数据结构，选取几种有代表性的曲线曲面，实现了三维复杂外形的表面描述。

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They are transient tangles in the sun’s magnetic field that are slightly cooler than their surroundings and so appear as dark patches in the photosphere—the surface layer of the sun.

它们是位于太阳磁场上暂时性的比周边温度偏低的混乱的一块区域，也因此看起来就像光球——太阳表层上的暗斑。

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These cells pile up on the surface of the skin when the body cannot shed them fast enough, leading to unsightly patches of raised red skin covered by a flaky white build-up.

BBC: Vaccine 'switches off' psoriasis

Odd patches of bright and dark material that scientists have yet to identify also appear on its surface.

WSJ: Asteroid Vesta Gets a Close Study