Spanner saw that gravity was what made things stay on the

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• 英语翻译In the 13th century,the famous Italian traveler,Marco Polo,traveled a long way to China.During his stay in China,he saw many wonderful things.One of the things he discovered was that the Chinese used paper money.In western countries,people did not use paper money until the 15th century.However,people in China began to use paper money in the 7th century.A Chinese man called Cai Lun invented paper almost 2,000 years ago.He made it from wood.He took
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