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[audioFiles]2015m7s/audio_ezfj_015_20153[/audioFiles]
[audioFiles]2015m7s/audio_ezfj_015_20153[/audioFiles]
游客
2023-11-05
55
管理
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Natural and Synthetic Rubber
People get natural rubber from rubber trees/as a white, milky liquid, which is called latex./They mix it with acid, and dry it,/and then they send it to countries all over the world./They started rubber planta tions in countries/with hot, wet weather conditions,/but these still could not give enough raw rubber/to meet the needs of growing industry./It was always possible mat wars or shipping trouble could stop supplies./In the end, they found a way of making artificial, man-made rubber/which is in many ways better than/and in some ways not as good as natural rubber./It is usually cheaper than natural rubber./Today, the world needs so much rubber that/we use both natural and artificial rubber in large amounts./
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