一个设计良好的空间应该在你踏入的那一刻就感觉像家一样。

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.

化学不仅是一门科学，更是一种思维方式。