【Ted动画科普：追溯“塑料”的发展史】 如今，塑料几乎无处不在，但你有想过它是怎么来的吗—— 追根溯源，在几个世纪前，台球一直由象牙制成。后因价格昂贵、大象数量锐减，纽约的台球制造商出高价赏金，征求象牙球的替代品。于是在1868年，John Wesley Hyaatt发明了名#经济#
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