A common gray or brownish-gray mouse (Mus musculus) that lives in or near buildings and often carries disease. It is frequently used in laboratory experiments.

• 家鼠：一种常见的灰色或棕灰色老鼠（台湾鼷鼠）生活在建筑物内或附近，通常携带病菌，经常被用于实验室做实验