文学是人类灵魂的镜子。

The world is full of stories, but only a few are worth telling.

The improvement of the productive powers of labor, and the greater part of the skill, dexterity, and judgement with which it is anywhere directed or applied, seem to have been the effects of division of labor.

发展过程简单来说就是：在每一代中，两个亲本性状都会出现，分离且不变。