n.(鸭子)嘎嘎叫声；庸医；冒充内行的人v.嘎嘎地叫；大声闲谈；冒充内行adj.骗人的
用作名词 (n.) A duck's quack doesn't echo and no one knows the reason.
鸭子呱呱叫是不会产生回音的
She discovered that the man was a quack.
她发现那人是个庸医。
The quack was stormed with questions.
江湖骗子受到了猛烈的质问。
用作动词 (v.) He landed among the tame ducks, and began to waddle around and quack merrily.
他落在了家鸭群中,开始四处踱来踱去,欢叫个不停,还吃起了地上的谷物。
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