义务是由于对法则的敬重而产生的行为必要性。

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.

艺术是我唯一感到自由的地方。

儿童的进步不是取决于年龄，而是取决于能够自由地观看他周围的一切。