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1.The disappearance of the baiji would be the first instance of a large aquatic mammal being driven to extinction since hunting killed off the monk seal around 1952.
自1952年左右僧海豹由于人类狩猎而惨遭灭绝以来，白暨豚的消失是大型水生哺乳动物被赶尽杀绝的第一例。收藏指正
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