quack
verb [ I ] uk/kwæk/ us/kwæk/
（鸭子）呱呱叫，嘎嘎叫
to make the usual sound of a duck
The ducks started quacking loudly when we threw them some bread. 我们向那些鸭子扔面包时，它们呱呱地大叫起来。
quack
noun [ C ] uk/kwæk/ us/kwæk/
(PERSON)
disapproving冒牌医生，江湖医生，庸医
a person who dishonestly pretends to have medical skills or knowledge
UK informal often disapproving医生
a doctor
Have you seen a quack about that cough? 你去医生那儿看咳嗽了吗？
(SOUND)
[ C ]（鸭子）呱呱叫，嘎嘎叫
the sound that a duck makes