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)