n.浮渣；糟粕；無價值之物
They tried to purge metal of dross. 他們試圖清除金屬熔化時浮升表面的渣滓。
For foreign cultures, we should discard their dross and select their essence. 對于外來文化，我們要取其精華，去其糟粕。
What's gold and silver? Mere dross. 金銀財寶，身外之物。
