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By Jerilyn Watson Broadcast: October 6, 2003 (THEME) VOICE ONE: An office in the United States government has helped protect 1)the property rights of inventors for more than two-hundred years. Its job

发表于:2018-12-07 / 阅读(44) / 评论(0)

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丹尼尔和阿美在观看中国古代的四大发明。丹丹觉得那些都是简单的东西，没有什么意义。其实他们的发明者都是一些很聪明的人。那最后丹丹的观点有没有改变呢？ Listen Read Learn May: There are so many people that the tickets are all sold out! Daniel: Luckily we

发表于:2018-12-26 / 阅读(30) / 评论(0)

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Listen Read Learn May: There are so many people that the tickets are all sold out! Daniel: Luckily we got the last two. May: Look, Danny. The Four Great Inventions! Daniel: Gunpowder, compass, the paper making, and the printing. May: I really admire

发表于:2018-12-31 / 阅读(25) / 评论(0)

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Section 38 Inventions They say that the world’s first great invention was the wheel. Perhaps we could argue that the discovery of fire was equally as important. Of course we don’t know who invente

发表于:2019-01-02 / 阅读(81) / 评论(0)

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THIS IS AMERICA - Patents and Inventions

THIS IS AMERICA - October 14, 2002: Patents and Inventions By George Grow VOICE ONE: An office of the American government has helped to protect the legal rights of inventors for two- hundred years. Th

发表于:2019-01-02 / 阅读(84) / 评论(0)

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发表于:2019-03-02 / 阅读(154) / 评论(0)

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