名词
中文翻译：水螅
同义词：
['hydra', 'hydroid', 'polyp']
例句：
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1.Utricularia is a type of marine invertebrate that lives in the water column.
水螅是一种生活在水柱中的海洋无脊椎动物。
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2. The hydra was found to have a unique ability to sense and respond to changes in its environment.
水螅被发现具有感知并响应其环境变化的独特能力。
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3. Polyps are small, soft-bodied animals that live in the water column and are often mistaken for hydras.
水母是小型、柔软的生物，生活在水柱中，经常被误认为是水螅。