A whalebone whale 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，具有大的头部和拱形的上颚。
Ivory, tortoise-shell, whalebone and whale- bone hair, horns, antlers, hooves, nails, claws and beaks, unworked or simply pre- pared but not cut to shape;
兽牙、龟壳、鲸须毛、角、鹿角、蹄、甲、爪及喙，未经加工或仅简单整理但未切割成形；
Ivory, tortoise-shell, whalebone and whale- bone hair, horns, antlers, hooves, nails, claws and beaks, unworked or simply pre- pared but not cut to shape;
兽牙、龟壳、鲸须毛、角、鹿角、蹄、甲、爪及喙，未经加工或仅简单整理但未切割成形；
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