1. First they made overshoes, and man called Mackintosh who made coats of cloth covered with natural rubber. 
   最初他们做成套鞋(指一种可套穿在皮鞋外以防湿或取暖的鞋)。后来，有一位名叫麦金托什的人，用涂上自然橡胶的布做外衣。
2. But these first rubber overshoes and raincoats were all soft and sticky in summer, and hard and unelastic in the winter when it was cold. 
   但是这些最初的胶鞋和雨衣在夏天都是又软又粘，到了冬天就又硬又没有弹性。
3. butyl rubber,isobutylene isoprene rubber 
   丁基橡胶
4. history of rubber industry 
   橡胶工业发展史
5. mixing of rubber compounds 
   混炼

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• 2. 是胶鞋（橡胶套鞋）
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