"A good sentence is a small miracle."
薪柴会烧完，火种却传下去，不会穷尽。
爱有时伴随着痛苦，但继续爱下去很重要。
The past explains the present - that is the fundamental premise of evolutionary psychology.
领导力意味着做出今天艰难的决定，以造福子孙后代。
定义就是限制。
Topology is the study of the properties of a figure that are unchanged by any deformation.