n.江湖医生；江湖郎中；（鸭子的）呱呱声；vi.（鸭子）发出嘎嘎声； 变形： 复数：quacks过去式：quacked过去分词：quacked现在分词：quacking第三人称单数：quacks 英英释义： quack[ kwæk ]n.an untrained person who pretends to be a physician and who dispenses medical advicethe harsh sound of a duckv.utter quacking noises"The