The strength of a habit is proportional to the amount of reinforcement.

真相往往藏在最简单的事物中。

想要行善的人在门外敲著门；爱人的，看见门是敞开的。

The metropolis exacts from man as a discriminating creature a different amount of consciousness than does rural life.

解码遗传密码的过程就像一步步解决一个复杂的谜题。