small animals and insects that can be harmful and are difficult to control when they appear in large numbers

Flies, lice, and cockroaches can all be described as vermin. 苍蝇、虱子和蟑螂都可以被称作是害虫。

an offensive word for people who are unpleasant and harmful to society

He thought all terrorists were vermin. 他认为所有恐怖分子都是害人虫。