The purpose of advertising is to sell. It is the only purpose.

永远不要停止学习，因为生活永远不会停止教导。

For those who do return back to the countryside, they find themselves very welcome locally, because with the knowledge, skills and networks they have learned in the cities, with the assistance of the Internet, they're able to create more jobs, upgrade local agriculture and create new business in the less developed market.

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.