此外，还分析了重演只能是“简单而迅速”的原因，并定义了一个表征个体发育时间与系统发育时间换算关系的时间当量。
Besides, we analyse the reason that the recapitulation can only be simple and rapid, and a time equivalent of conversion relation between the time of ontogeny and phylogeny is also defined.
在一物种胚胎个体发育和分化期间，该物种的进化阶段有假定的重演现象。
The supposed recurrence of the evolutionary stages of a species during the embryonic development and differentiation of a member of that species.
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