stewartite bort磁性下等钻
Dutch bort荷兰圆粒金刚石
Stephen Bort斯蒂夫·波特
bort bit[机] 金刚石钻头;不纯金刚石钻头
shot bort高硬圆粒金刚石
common bort普通工业钻;下等金刚石
round bort圆粒钻石
river bort河水劣质钻
Balthasar Bort荷军统帅博特
N（名词） an inferior grade of diamond used for cutting and drilling or, in powdered form, as an industrial abrasive 圆粒金刚石; 切割或钻孔用的次等金刚石，其粉末用作工业研磨料