经验是一所好学校，但学费很高。
Experience is a good school, but the fees are high.
A distributed system is one in which the failure of a computer you didn't even know existed can render your own computer unusable.
即使学术再精湛，如果道德不足，就像在流沙上建造高楼，稍有震动就会倒塌。
我不是因为快乐而唱歌，我因为唱歌而快乐。
The essence of mathematics lies in its freedom.
"I write to escape the world, but I always end up describing it."