- vestigal
- 器官: organ; apparatus
- 退化: become vestigial; degenerate ...
- 的: 4次方是 The fourth power of 2 i ...
- 退化的: catagenetic; degenerate; degenerative; degraded; devolutive; obsolete; pejorative; regressive; retrograde; retrogressive; rudimental; rudimentary; vestigial - fully developed
- 退化器官: reduced organ; rudimentary organ; rudimentum; vestige; vestigial organ
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