n.浮渣；糟粕；无价值之物
They tried to purge metal of dross. 他们试图清除金属熔化时浮升表面的渣滓。
For foreign cultures, we should discard their dross and select their essence. 对于外来文化，我们要取其精华，去其糟粕。
What's gold and silver? Mere dross. 金银财宝，身外之物。
