来自《耶鲁大学开放课程：生物医学工程探索 第6集 第6集》
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that happens during development发生的一种变化 -
and cells somehow know where they are而且细胞似乎知道它们 -
within this developing asymmetrical organism.在这个非对称发育生物体中的位置 -
How does that happen?怎么会这样的呢 -
It happens through a very regulated,这是通过一种严格协调调控的过程完成的 -
coordinated slow process of what is called differentiation.这个过程我们称为细胞分化 -
Cells move from a state of limited differentiation细胞从一个有限的分化状态 -
to a state of more differentiation.进入一个更深层次的分化状态 -
The zygote or this fertilized egg受精卵 或者说已受精的卵子 -
is a completely undifferentiated cell.是一个完全未分化的细胞 -
We'll talk about another word for this later,我们之后还会再提到 -
but it's a cell that's going to give rise而这个细胞将孕育出