"月鼠"是个多义词，它可以指月鼠（啮齿目月鼠科物种）,月鼠（起点中文网作家）。
当老鼠子女六个星期或三个月大的时候，科学家分别提供正常的食物(鼠粮)或他们母亲曾吃过的垃圾食品供他们选择。
When the rats' offspring were six weeks and three months of age, scientists gave them the choice of eating regular food (the chow) or the same "junk food" certain mothers ate.
到了七月，当时的国王查尔斯二世被迫离开伦敦，临走前做出了导致瘟疫扩散更快的错误决定。 他下令宰杀了城中所有的猫狗致使鼠患成灾，而老鼠身上的跳蚤正是传播瘟疫的始作俑者。
By July King Charles had fled and ill-advised instructions to eradicate all the cats and dogs in the city sent the rat population skyrocketing -- rats carried the fleas that carried the disease.
能签发除鼠证书的最晚日期是《国际卫生条例(2005)》生效的前一天，即2007年6月14日。
The latest date that a Deratting Certificate can be issued is one day prior to the entry into force of IHR (2005) or 14 June 2007.
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