And he gave a very good analogy in saying, "It was almost as incredible as if you'd fired a 15 inch shell at a piece of tissue paper, and it came back and hit you."

他还打过一个很好的比方：,“这就像是,你用个15英寸果壳,打到面巾纸上被弹回来打到你，一样不可思议，“

麻省理工公开课 - 化学原理课程节选

Now, you know, take your hands and kind of do that and you can get a sense of how small that really might be.

你们可以用自己的手指比划下,感觉下三英寸有多小

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