It is indeed an opinion strangely prevailing amongst men， that houses， mountains， rivers， and in a word all sensible objects， have an existence， natural or real， distinct from their being perceived by the understanding.

生命是一首歌，随之起舞。

我们需要一个更主权、更团结、更民主的欧洲。

A key insight in learning theory is that the complexity of a hypothesis class is crucial for generalization.