释义:水一旦泼出去,就收不回来,后悔也来不及。  
The search for exoplanets is not just about finding new worlds; it's about understanding our place in the cosmos.
The greatest prosperity can exist only as the result of the greatest possible productivity of the men and machines in the establishment.
The moral feeling of human nature is an obligation, and we must endow the soul with the sense of beauty.