The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
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。
除非我能看到50%的回报，否则我从不买股票。
The only real elegance is in the mind; if you've got that, the rest really comes from it.