所有人要么是自由的，要么是奴隶。
The past explains the present - that is the fundamental premise of evolutionary psychology.
保卫国家政权，是那些君主和臣子等享受俸禄的人谋划的事；保卫整个天下，即使是地位低微的普通百姓也有责任参与。
I always did something I was a little not ready to do. I think that’s how you grow.
The deepest theorems in mathematics often have the simplest statements.