释义:水一旦泼出去,就收不回来,后悔也来不及。  
The more we live by our intellect, the less we understand the meaning of life.
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones。
恐惧风险的本能,反而让穷人承担更大风险。
银河系中心是强引力下的一个独特的自然实验。