Don’t say anything about someone in email you would not be comfortable saying to them directly， because eventually they will read it.

对民主的爱就是对平等的爱。

The beauty of topological insulators lies in their robustness; their surface states are protected against disorder and imperfections.

Life in the state of nature is solitary， poor， nasty， brutish， and short.

基础结构决定论原则认为，社会文化系统的结构受人口、技术和环境相互作用的影响最为强烈。