粉斑 meaning in English
chalk mark
filler specks
powder blotting
Examples
- Remove corrosive salts , chalk marks , soil or other contaminants and foreign matter by brushing the steel with a stiff fiber or wire brush or a combination of both
用硬纤维、钢丝刷或二者之一擦拭钢材表面除去附着的锈盐、粉斑、油迹及其他污染物。