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A whalebone whale(Balaena mysticetus) of Arctic seas, having a very large head and an arched upper jaw. 北极露脊鲸，弓头鲸生活在北冰洋的一种有鲸须的鲸鱼（北极露脊鲸露脊鲸属），具有大的头部和拱形的上颚。