Because we know as we go to infinity, even though the density gets smaller and smaller and smaller, we still have electron density very far away from the nucleus.

因为我们知道即使到了无穷远处，尽管电子密度会变得非常非常非常小，但我们仍然有一定的电子密度，无论离原子核多远。

化学原理课程节选 : 麻省理工公开课

I don't even care if you try to put it at the heart of the nucleus.

我甚至不介意,如果你试着把它放在原子的中心。

固态化学导论课程节选 : 麻省理工公开课

A small molecule gets produced by cells in one part of the body, circulates in the blood, estrogen enters cells, and sometimes that estrogen is able to penetrate deep within the cell, even into the nucleus.

雌激素是由身体某部分细胞分泌的,随着血液循环进入细胞,有时雌激素能够进入到细胞内部,甚至进入到细胞核内

生物医学工程探索课程节选 : 耶鲁公开课