Okay. That is Beethoven, Ludwig van Beethoven, and do you know the name of the piece?
好的,就是贝多芬,路德维希·凡·贝多芬,那么你知道这首曲子的名字吗
People have names. People have distinct, individual names that mark them as people and once you know somebody's name you are less likely to do bad things to them.
人都有各具个性的名字,这标志他们的人性,一旦你知道某个人的名字,你对他行恶的可能性就会降低。
This is what's called the Bohr radius, and we'll explain - hopefully we'll get to it today where this Bohr radius name comes from, but for now what you need to know is just that it's a constant, just treat it like a constant, and it turns out to be equal to or about 1/2 an angstrom.
它叫做玻尔半径,我们后面会解释,希望我们今天可以讲到,波尔半径这个名称的由来,但现在你们只要记住,它是一个常数,只要把它当做一个常数对待,它等于,或者是1/2埃。
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