The essence of causal inference is to go beyond the data and ask what would happen if we intervene.
The best way to predict the future is to create it.
Farmers are the first environmentalists, working with nature every day.
发愤研究学问,常常忘记吃饭,一旦有所收获便又高兴地忘记了忧愁,连自己的渐趋衰老也没有感觉到。
森林的真正价值远远超出了它的木材。