名词
中文翻译：Unknown
同义词：
['1. bladder', 'sac', 'bag', 'lung']
例句：
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1. The fish has a fucan in its mouth.
这条鱼嘴里有气囊。
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2. The fish is swimming with its fucan attached to its body.
这条鱼带着它的气囊在水中游动。
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3.The fish is swimming with its fucan attached to its body.
这条鱼带着它的气囊在水中游动。