The Internet is a network of networks, governed by the principle of interoperability.

The test of a good building is how it makes you feel when you're inside it.

世界是一本书，不旅行的人只读了一页。

我不知道什么是更好的，是上床还是赚钱。

我们需要世界上的思想多样性来面对新的挑战。

The PAC learning framework provides a formal way to quantify the learnability of a concept class.