A: Just think Bill Gates, those inventions are as important as the windows system.
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B: Luckily we got the last two.
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B: Well, I suppose the ancient inventors made a lot of money out of them.
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A: I really admire those who made such great inventions!
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B: Milestones? May, you must be kidding.
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A: There are so many people that the tickets are all sold out!
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B: May, I don't see why they are great. They are just simple things.
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A: No, quite the contrary.
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A: They look simple today. But they were milestones in their times.
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A: Look, Danny. The Four Great Inventions!
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B: Gunpowder, compass, the paper making, and the printing.
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B: Why? Didn't you say that they were milestones?
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A: Yes, but they went to the public without any patent protection.
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B: Well, their inventors were not as clever as Bill Gates.
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