If you have an apple and I have an apple and we exchange 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.
如果你有一个苹果，我也有一个苹果，我们交换后，每个人仍然只有一个苹果。如果你有一个好主意，我也有一个好主意，我们交换后，每个人就能拥有两个好主意了！
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