人的行为是他们思想的最好解释者。
The actions of men are the best interpreters of their thoughts.
The challenge in computational learning theory is to understand the capabilities and limitations of learning algorithms.
The past is a foreign country; they do things differently there.
我们生产的每一桶石油都伴随着比以往做得更好的承诺。
The world is a cruel place, but it is also beautiful.