The state, therefore, has not existed from all eternity. There have been societies that did without it, that had no notion of the state or state power. At a certain stage of economic development, which was necessarily bound up with the split of society into classes, the state became a necessity.

团队是第一位的。我必须做对团队有利的事，而不仅仅是为自己。

讨论学问要看其人的品行，讨论政治要考察当时的形势

煤炭行业是美国能源独立的支柱，已经持续了几代人。