The shale revolution has transformed the U.S. into a global energy leader.

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.

I'm the reason your boyfriend's so stressed.

犯罪小说是探索人类境况的完美载体。

爱是想触碰却又收回手。

数学的历史是人类思想和进步的历史。