一个命题的证明是一种性质使得我们相信该命题的过程。
A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.
I didn't start a business to make money, but to change the world.
最伟大的冒险发生在脑海中。
Art is my entire life.
We are in the business of making our customers successful.
我不是那种会让我的忠诚动摇的人。
一切迄今为止社会的历史都是阶级斗争的历史。