要理解递归，首先必须理解递归。
The poet is not separate from the world; the poet is of the world.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
生物普遍存在的生存斗争不是为了原材料——这些对生物来说是充足的——也不是为了能量，能量以热的形式在任何物体中都大量存在，而是为了熵，熵是通过能量从炽热的太阳转移到寒冷的地球而变得可用的。
The only thing necessary for the triumph of evil is for good men to do nothing.
The protection of fishery resources is not a multiple-choice question, but a required question.