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。
No man really knows about other human beings. The best he can do is to suppose that they are like himself.
CLEANLINESS. Tolerate no uncleanliness in body, cloaths, or habitation.
The most dangerous risk is refusing to take any risks at all.
The more you know, the more you can know.