Mathematics is a dialogue between the past and the present.
"Effort makes you. You will regret someday if you don’t do your best now. Don’t think it’s too late but keep working on it."
能源效率是我們減少排放過程中默默無聞的英雄。
文學和科學相比，的確沒什么用處，但文學最大的用處，也許就是它沒有用處。
The anarchic nature of the international system means that states must rely on self-help to ensure their survival.