quack

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

There were ducks quacking on the lawn. 有鸭子在草坪上发出嘎嘎的叫着。

2. N-COUNT/SOUND Quack is also a noun. 嘎嘎声

Suddenly he heard a quack. 突然，他听到嘎的一声。

3. N-COUNT If you call someone a quack or a quack doctor, you mean that they claim to be skilled in medicine but are not. 庸医; 江湖医生[oft N n] [表不满]

I went everywhere for treatment, tried all sorts of quacks. 我为求医走遍了每一寸土地，尝试了所有江湖医生的疗法。

4. ADJ Quack remedies or quack cures are medical treatments that you think are unlikely to work because they are not scientific. 江湖疗法的[ADJ n] [表不满]

5. V to act in the manner of a quack 以庸医之道行医