The real challenge lies in making small-scale farmers part of the global solution.

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。

There's a tendency to think that our present politicians are much worse than we had in the past.But we tend to forget how awful our politicians were in the past.

海洋的极限不容谈判，我们的实践必须适应。