• So if you think of a shell, you can actually just think of an egg shell, that's probably the easiest way to think of it, where the yolk, if you really maybe make it a lot smaller might be the nucleus.

    可以把它想成,个蛋壳,这也许是,最简单的思考办法,蛋黄如果,缩小非常多倍的话,就可以想象成核子。

    麻省理工公开课 - 化学原理课程节选

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