Objective: To explore the process of genesis and development of long bone of human fetus.

目的探讨人胚胎长骨的发生及发育过程。

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To explore the effect of early education on infant growth and development.

研究早期教育对婴儿生长发育的影响。

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To explore the effect of early education on infant growth and development.

研究早期教育对婴儿生长发育的影响。

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