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2013-05-23 12:21
求翻译：The first bicycle, which was very simple, （3） in 1790. People called "the horse on wheel". Then in 1861, after many improvements being made, the bicycle became a practical （4） of transportation.是什么意思？ 待解决
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The first bicycle, which was very simple, （3） in 1790. People called "the horse on wheel". Then in 1861, after many improvements being made, the bicycle became a practical （4） of transportation.
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