如果你有一个苹果,我有一个苹果,我们彼此交换,每人还是一个苹果;但如果你有一种思想,我有一种思想,我们彼此交换,每人可拥有两种思想。
(If you have an apple and I have an apple and we exchange these apples then you and I will still each have one apple. But if you have an idea and I have an idea and we exchange these ideas, then each of us will have two ideas. By George Bernard Shaw)