形容词
中文翻译：背部的
同义词：
['dorsal', 'dorsal', 'dorsal']
例句：
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1. The dorsal finis the first part of the fish's body to grow out from the head.
背鳍是鱼身体从头部生长出来的第一部分。
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2. The dorsalfin helps the fish swim by guiding itsmovements.
背鳍帮助鱼游泳，通过引导其运动。
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3. The dorsalfin is a unique feature of many fishspecies.
许多鱼类都有独特的背鳍特征。