Different understandings of what that piece means gives you different values, and that's a bit of a problem.

应该是半径为1角度为,弧度为2比圆周率的一半，稍微多一点。

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Right. It's a slight lie, it doesn't have all possible values, but you get the idea. It has, if you like, intellectually, all possible values.

我撒了个小谎，这个空间并没有包含所有的可能的值，你们懂的，理性点说，如果你喜欢，我这么说的话，它包括了所有可能的值。

麻省理工公开课 - 计算机科学及编程导论课程节选

That's different when you have continuous values-- you don't have P because it's always zero.

和离散型随机变量的分布不同的是,连续型随机变量的分布中,某一点的概率值始终是零

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