词根词缀:angle, angu-
【来源及含义】Latin: a corner, a bend
【同源单词】acutangular, acute angle, angle, angle, angular, angularly
词根词缀:penta-, pent-, pente-, pento-
【来源及含义】Greek: five; a number used as a prefix
【同源单词】molybdenum pentachloride, pentacanth, pentacanthous, pentachord, pentacle, pentactinal