科学家认为犬类能够闻出他人的病症是因其继承了狼类的净化血统，狼族需要能够嗅出其种群中是否有伤病员。
Scientists believe that dogs can sense disease in others because of their evolutionary origin as wolves, who needed to be able to detect when someone in the pack was hurt or sick.
由于没有王室或贵族的血统，米德尔顿将成为几世纪以来第一个与王室继承人结婚的平民。
With no royal or aristocratic pedigree, Middleton will be the first commoner to marry an heir to the throne in centuries.
这位合法的继承人为了保命，不得不隐瞒自己的血统这一幽暗的秘密。
The rightful heir, keeping his ancestry darkly secret, a necessity to preserve his life.
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