dreg /ˈdrɛg/
渣滓,沈澱物,糟粕
Dreg n. Corrupt or defiling matter contained in a liquid, or precipitated from it; refuse; feculence; lees; grounds; sediment; hence, the vilest and most worthless part of anything; as, the dregs of society.
We, the dregs and rubbish of mankind. --Dryden.
Note: ☞ Used formerly (rarely) in the singular, as by Spenser and Shakespeare, but now chiefly in the plural.
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dreg
n : a small amount of residue