Any of several whales of the family Balaenidae, characterized by a large head, whalebone plates in the mouth, and absenceof a dorsal fin.
露脊鲸：露脊鲸科中的几种鲸，特征为头部硕大、嘴边长有鲸须而无背鳍。
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Bart syndrome is a genetic disorder characterized by the association of congenital localized absenceof skin, epidermolysis bullosa, lesions of the mouth mucosa, and dystrophic nails.