a hard nonresilient rubber formed by vulcanizing natural rubber
同义词：hard rubber, vulcanite
ebonite详细解释
eb.on.ite n.（名词）A relatively inelastic rubber, made by vulcanization with a large amount of sulfur and used as an electrical insulating material.硬橡胶：一种用大量硫磺硬化而成的相对无弹性的橡胶，用作绝缘材料
