US researchers studied the brain activity of rats kept awake during the day - the time they would usually sleep.
美国的研究人员进行了一项实验，他们让一种习惯昼伏夜出的小老鼠白天不睡觉，以此来研究它们大脑的活动情况。
A weasellike, usually albino mammal(Mustela putorius furo)related to the polecat and often trained to hunt rats or rabbits.
白鼬，雪貂一种象鼬的通常为白化体的与艾鼬有关的哺乳动物（鼬属雪貂），经常被驯养来猎取鼠和野兔。
However, malignancies usually occur when fragments of these tumors are transplanted in other rats.
但如把此肿瘤的组织块移植于其他大鼠则经常表现出恶性。
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