一个问题如果在计算机上可以快速解决，那么它属于P类问题；如果一个解可以快速验证，那么它属于NP类问题。

Success is doing what you want to do, when you want, where you want, with whom you want, as much as you want.

可持续性不再是可选项；它是农业未来的必需品。

可持续性不是一种趋势；这是我们对后代的责任。