Sustainable development is not a slogan, but a social responsibility that enterprises must undertake.
The most important political development of the modern era is the rise of the modern state.
难道你看不出一个充满痛苦与烦恼的世界对于磨练智慧、造就灵魂是多么必要吗?
A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between theories and the best mathematician can notice analogies between analogies.