dross是什么意思_dross怎么读_音标drɔs, drɔ:s

dross是什么意思音标:英 [drɔs, drɔ:s]美 [drɑs, drɔs]

n. 浮渣, 碎屑, 渣滓
[化] 浮渣

n worthless or dangerous material that should be removed
n the scum formed by oxidation at the surface of molten metals