英、美、加三国研究者的合作始于1998年流冰区的高山上发现古代驯鹿的骨骼和排泄物的时候。
Researchers from the U.S., U.K. and Canada have been collaborating since 1998, when ancient caribou bones and feces were found in high mountain ice patches.
在加拿大的育空地区，科学家们正在利用基因技术来鉴别北美驯鹿，并探究古时驯鹿的相关信息，6000年前它们曾在这块流冰区漫步。
In the Canadian Yukon, scientists are using genetic techniques to identify caribou and to study ancient caribou that roamed the same ice patches 6,000 years ago.
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