因此,自爱是行动的必要原则。
Self-love, then, is a necessary principle of action.
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
语言是一种皮肤:我用我的语言摩擦对方。就好像我有的是词语而不是手指,或者我的词语的尖端是手指。