Those who study life usually speak only of involution and evolution; those who study the form, namely, the modern scientists, are concerned with evolution only.

那些研究生命的人通常只是提到退化和进化。

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Smooth skin of overall shape of evolution can be summarized by the following six epidermis movement epiboly, convexity, invagination, involution, ingression and delamination.

光滑表皮在拓扑变换中形态演化总体可概括为以下六种表皮发生机制：外包、外突、内陷、内卷、内移以及层裂。

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