Results The pulmonary tissue of control group small rat has no obvious change.

结果对照组小鼠肺组织无明显改变。

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To train a rat, the experimenter placed it in an operant conditioning chamber: a small plastic box with a lever at one end.

为了训练小鼠，实验人员把它放在一个操作性条件反射室：一个一端置有操作杆的塑料箱。

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Ratsky is the name I gave a small white rat I took homefrom the college psychology lab many years ago.

拉特斯基是我给多年前从大学心理实验室带回家的一只小白鼠起的名字。

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An appeal for volunteers has been launched in the Isle of Man in an effort to eradicate the rat population on a small bird sanctuary in the Irish Sea.

BBC: Calf of Man islet rat-cull project calls for volunteers

She has been, depending on how one holds her in the light, a small Jack Russell, a large Chihuahua, a Rat Terrier, a Fox Terrier and a Corgi with legs.

NPR: 'Dog is My Co-Pilot'