The history of astronomy is a history of receding horizons.
天文学的历史是一部视野不断扩展的历史。
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
世界是平的,但竞技场并不公平。
The best way to cheer yourself up is to try to cheer somebody else up.
Every tree we plant today is a legacy for tomorrow.