boron carbide
boron-carbide的词性：
n.（名词）
1. A compound of boron and carbon, especially B4C, an extremely hard, black crystalline compound or solid solution. It is used as an abrasive, in control rods for nuclear reactors, and as a reinforcing filament in composite structural materials.
碳化硼：硼和碳的化合物，尤指B4C，一种异常坚硬的黑色结晶化合物或固体溶液。用在磨砂、核反应控制杆中，在复合建筑材料中用作强化剂