Objective : Pterygium formation is the process of the arising and extending of wing-shaped fold of fibrovascular tissue from the interpalpebral conjunctiva to the cornea.

目的：翼状胬肉是指睑裂区的增殖性组织自结膜长至角膜的一系列过程。

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Anchiornis's wrist bone was so wedge-shaped that it could fold its arms to its sides, keeping its arm feathers off the ground as it walked.

近鸟龙的腕骨呈深楔形，因此它可以将前肢折叠到身体两侧，行走时前肢上的羽毛可以悬空，不会拖在地面上。

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The thrust faults with a fan-shaped often are evolved in the steep wing and are formed after the fold deformations have reached a definite stage.

扇状逆冲断层往往在褶曲陡翼发育，产生于褶皱变形达到一定阶段之后。

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