比如人类胚胎会发育出腮、蹼足和退化的尾巴，映现出远古水生生物的性状。
Human embryos, for instance, develop, then lose, gills, webbed feet and rudimentary tails, reflecting their ancient aquatic life styles.
同样，尽管有些鲸鱼也有味蕾，但这些味觉器官要么已经退化，要么就根本没有发育。
Similarly, although at least some cetaceans have taste buds, the nerves serving these have degenerated or are rudimentary.
随着卵母细胞的发育进程，滤泡细胞经历了发育和退化过程。
Developed with the oocytes, follicular cells experienced a process from development to deterioration.
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