例如问题-为西洋镜的熊家和森林。
Example Questions - Make a diorama of the bears' house and the forest.
埃利斯借鉴了其他作家和历史学家的记录，并且时常回到猎人对北极熊生存所构成的威胁上来。
Mr Ellis draws on the accounts of other writers and historians, and often returns to the threat that hunters pose to the survival of the species.
海洋哺乳动物专家和世界自然基金会(WWF)相信，现在该地区的北极熊数目在持续增长。
Marine mammal experts and the WWF believe the polar bear population in the region is increasing.
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