n. an untrained person who pretends to be a physician and who dispenses medical advicen. the harsh sound of a duckv. utter quacking noises
n. 鸭叫声, 冒牌医生, 冒充内行之人a. 冒牌医生的v. 嘎嘎叫, 当冒牌医生, 夸大广告