Making something variable is easy. Controlling duration of constancy is the trick.

研究明史需要全面理解其独特的社会结构和文化背景。

写作是一种思考的方式，一种发现你真正相信什么的方式。

Don’t be afraid to fail, be afraid not to try.

Any sufficiently advanced technology is indistinguishable from magic.

Acquiring things will rarely bring you deep satisfaction. But acquiring experiences will.