quack

noun

1. the harsh sound of a duck

2. an untrained person who pretends to be a physician and who dispenses medical advice

verb

1. act as a medical quack or a charlatan

2. utter quacking noises

e.g. The ducks quacked

1. 庸医；江湖郎中；冒牌医生
If you call someone a quack or a quack doctor, you mean that they claim to be skilled in medicine but are not.

e.g. I went everywhere for treatment, tried all sorts of quacks.
我四处求医，看过了各种各样的江湖郎中。

2. 江湖医术;骗人的医术
Quack remedies or quack cures are medical treatments that you think are unlikely to work because they are not scientific.

e.g. Why do intelligent people find quack remedies so appealing?
为什么聪明人会被江湖医术所吸引？

3. (鸭子)发出嘎嘎声
When a duck quacks, it makes the noise that ducks typically make.

e.g. There were ducks quacking on the lawn.
草地上有几只鸭子在嘎嘎叫。

1. 嘈杂声：QD quick disconnect 迅速断开 | Quack 嘈杂声 | QUAD quadriphonic 四声道立体声

2. quack

2. 体力劳动者：isno 学习学习再学习. | quack 体力劳动者. | refdom 话不多.

3. (鸭等)嘎嘎声：neigh:马等嘶叫声 | quack: 鸭等嘎嘎声 | roar: 狮虎等咆哮声