社会结构的研究是构成社会的社会关系系统的研究。

Don’t take it personally when someone turns you down. Assume they are like you: busy， occupied， distracted. Try again later. It’s amazing how often a second try works.

The future of democracy depends on its ability to deliver economic growth and social justice.

国际法的发展是一个不断平衡主权与全球治理的过程。