Every challenge in livestock farming is an opportunity to innovate.

森林的真正价值不是用板英尺衡量，而是用生物多样性和碳封存。

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

结社的能力反过来取决于社区分享规范和价值观的程度，以及能够将个人利益服从于更大群体利益的程度。