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v.（鸭子）发出嘎嘎声( quack的现在分词 )； 英英释义： quackn.an untrained person who pretends to be a physician and who dispenses medical advicethe harsh sound of a duckv.utter quacking noises"The ducks quacked"act as a medical quack or a charlatanadj.medically unqualified"a
