如果你成长于一个贫穷的街区，你就会更容易意识到有人跟着你试图偷你的包。“奥斯特兰德先生说。”
"If you grew up in a poorer neighborhood, you'd be more aware of someone coming up behind you and stealing your bag," Mr. Ostrander said.
奥斯特兰德博士的研究显示，犬类中的这种现象由一种牵扯生长规律的“假基因”死而复生所引起的。
Dr Ostrander's work showed that in dogs it is caused by the reactivation of a "dead" version of a gene involved in the regulation of growth.
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