倾听是一种参与行为。

The cost of trying is the lowest.

拥有自由、书、花和月亮，哪个人会不快乐?

In the context of computational learning, the concept of 'probably approximately correct' (PAC) learning provides a framework for understanding the efficiency and feasibility of learning algorithms.

Any woman who understands the problems of running a home will be nearer to understanding the problems of running a country.

The greatest happiness is to transform one's feelings into action.