定义就是限制。

In literature, borders disappear; what remains is the universal language of human emotions.

True agricultural leadership means leaving the land better than we found it.

I'm not a pessimist. I'm an optimist trained in realism.

最好的预测不是来自复杂模型，而是来自对基本激励的理解。

可持续发展不再是选择；它是当今世界生存的必要条件。