抽象的目的不是模糊，而是创建一个新的语义层次，在这个层次上可以绝对精确。
There are no hard distinctions between what is real and what is unreal, nor between what is true and what is false. A thing is not necessarily either true or false; it can be both true and false.
释义：失败了不要总陷入后悔中，不能错失机会。
The attosecond timescale is to electron motion what the high-speed camera was to studying animal locomotion.