名词
中文翻译：背部的
同义词：
['dorsal fin', 'dorsal spine', 'dorsal fins']
例句：
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1.The dorsal fin is a crucial part of the fish's body that helps it swim efficiently.
背鳍是鱼身体中至关重要的部分，它帮助鱼高效游泳。
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2. The dorsal spine is a long, slender structure located on the back of many animals.
背脊是许多动物背部的长而细的结构。
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3.The dorsal fins are small, bony projections that help fish move through water.
背鳍是小骨突起，帮助鱼类在水中移动。