“硬度”用英语怎么说

硬度较低的石头磨光滑了。The softer rock wears away.讲硬度, 金刚钻是独一无二的.With regard to hardness, the diamond is in a class by itself.铅是硬度较低的金属之一.Lead is one of the softer metals....

“硬度”的拼音为：yìng dù...