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Asked by Mr.person from yemen | Jan. 08, 2009 20:27
About:Yuan Dynasty

i did not lern nothin bout nothin. i needed achevments:(

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Answered by Mr.Wong | Jan. 09, 2009 02:52
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In the Yuan Dynasty, Marco Polo came to China. He helped China know about the outside world.Chinese astronomy got much development at that time. A lot of astronomy equipments were invented， such as armillary sphere and azimuth instrument.
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