抽象是管理软件系统复杂性的关键。
Abstraction is the key to managing complexity in software systems.
The future of energy lies in balancing economic growth with environmental stewardship.
我们生活中最美好的时刻不是被动的、接受的、放松的时刻……最美好的时刻通常发生在一个人自愿努力完成一项困难而有价值的事情时,身体或精神被拉伸到极限。
We can say things with words; and we can do things with words.
Cada libro es una puerta a un mundo desconocido, una invitación a explorar lo desconocido.