In 2004, Professor Baughman invented a super-strong, super-light magic material

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问题 In 2004, Professor Baughman invented a super-strong, super-light magic material and he named it "mithril" — after the precious armor in the popular filmThe Lord of Rings. [br] The artificial joint with ______ , being a good imitation of natural bone protein, can attract bone cells and become quickly incorporated into the body.

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答案 a nanotube coating

解析 参见最后一段:...Fenniri has made a nanotube coating for the artificial joint. It’s a very good imitation Of collagen,a natural protein that is part of bone.As a result,the coating attracts bone cells.This is important because bone growth helps integrate an artificial joint into the body
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