an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
双语例句
So a fertilized egg is an example of totipotency. 所以受精卵是一个全能干细胞的例子。
And it all starts with a single upright egg. 这一切仅由一颗受精卵开始。