n. vole
misc. field mouse
多瘤病毒：存在于野鼠身上、数量极少、致病力不强的一种感染性小病原体。
Polyoma virus: Minute infectious agent normally present in extremely small amounts in wild mice without causing obvious ill effects.
他们将野鼠放入笼内，令猫缓缓接近它们，并仔细地观察每个笼子内老鼠的反应。
They put wild rats in cages and then brought cats gradually closer to them. At each stage, they carefully observed how the rats reacted.
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