名词
中文翻译：背部的
同义词：
['dorsal fin', 'dorsal ridge', 'dorsal spine例句：1. The fish swims with its dorsal fins sticking out.（这条鱼用它的背鳍在游动。）']
例句：
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1. The fish swims with its dorsal fins sticking out.
这条鱼用它的背鳍在游动。
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2.The dorsal fin is the most visible part of the shark's body.
背鳍是鲨鱼身体上最显眼的部分。
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3. The dorsal fin is used to help the fish stay afloat in the water.
背鳍帮助鱼类在水中保持浮力。