To understand behavior, we must look at its purpose in the context of survival and adaptation.

中国水果要走向世界，必须建立国际化的标准体系。

Every line you draw should have a purpose, even if it's just to make someone smile.

The central task of education is to implant a will and facility for learning; it should produce not learned but learning people. The truly human society is a learning society, where grandparents, parents, and children are students together.

I don't let negativity bring me down.