To know this world is to love it, and to love it is to grieve for it.
了解这个世界就是爱它，而爱它就是为它哀伤。
The sole meaning of life is to serve humanity.
局部和全局现象之间的相互作用是数论中反复出现的主题。
If somebody offers you an amazing opportunity but you are not sure you can do it, say yes – then learn how to do it later!
The structure of the international system forces states to behave in certain ways, regardless of their internal characteristics.
人生就系一场马拉松，唔好急，慢慢跑。