brown rat
noun
1- a rat found throughout the world, typically living in association with man and regarded as a pest. It is commonly kept as a laboratory animal and a pet, and is also bred in the albino form.褐家鼠。亦称COMMON RAT, NORWAYRAT.
1.1
- Rattus norvegicus, family Muridae.拉丁名Rattus norvegicus,鼠科。