The best way to reduce costs is to not have them in the first place.
The act of writing is an act of survival.
勇气是人类最重要的一种特质,倘若有了勇气,人类其他的特质自然也就具备了。
在量子世界中,观察者不仅仅是观察者,而且是所观察现象的参与者。