名词
中文翻译：Unknown
同义词：
['dorsal fin', 'dorsal ray']
例句：
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1. The fish had a long dorsal fin that helped it swim efficiently.
这条鱼有一条长长的背鳍，帮助它高效地游动。
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2. The dorsal fin was visible through the water, indicating that the fish was swimming upstream.
通过水面可以看到背鳍，表明这条鱼正在逆流而上。
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3. The dorsal fin is an important part of the fish's body structure and helps it navigate through thewater.
背鳍是鱼体结构的重要组成部分，帮助它在水中导航。