A2 a small rodent, larger than a mouse, that has a long tail and is considered to be harmful鼠;老鼠;大家鼠
More examples
Bottles of lemonade doctored with rat poison were discovered in the kitchen.
In biology classes at school we used to dissect rats.
The period of gestation of rats is 21 days.
The barn was infested with rats.
We put down some poisoned bait to kill the rats.
informal an unpleasant person who deceives others or is not loyal卑鄙小人;骗子;背信弃义的人
noun
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