时间是一条既向前流又向后流的河流。
Parental investment is the key to understanding sex differences in mating strategies.
A person may cause evil to others not only by his actions but by his inaction， and in either case， he is justly accountable to them for the injury.
Language is not just a means of communication, but a way of existing in the world.
创新不仅仅是关于新的想法，而是关于有效地执行它们。
爱一个人就是要懂得如何失去他们。
Success is not final, failure is not fatal: It is the courage to continue that counts.