板块构造理论是地质学的统一理论。
自由贸易使得资源得以最优配置。
Collaboration is the key to solving the world's most pressing problems.
I’ve found time can heal most anything.
解释:走夜路的人可以保证自己不做坏事,但却没有办法让狗不对着自己乱叫。
晏子春秋