You have to be willing to sacrifice to get what you want or what you need.

一个国家的法律如果不能保证公平公正、不能惩恶扬善、不能保障人民的利益，就不能当做法律。

我从不考虑过去。我总是期待下一个挑战。

The challenge in computational learning theory is to understand the capabilities and limitations of learning algorithms.