n.(鴨子)嘎嘎叫聲；庸醫(yī)；冒充內(nèi)行的人

v.嘎嘎地叫；大聲閑談；冒充內(nèi)行

adj.騙人的

A duck's quack doesn't echo and no one knows the reason. 鴨子呱呱叫是不會產(chǎn)生回音的

She discovered that the man was a quack. 她發(fā)現(xiàn)那人是個庸醫(yī)。

The quack was stormed with questions. 江湖騙子受到了猛烈的質(zhì)問。

He landed among the tame ducks, and began to waddle around and quack merrily. 他落在了家鴨群中,開始四處踱來踱去,歡叫個不停,還吃起了地上的谷物。

He was told that it's a quack medicine. 他被告知這是假藥。