名词
中文翻译：水螅
同义词：
['hydra', 'hydroid', 'polyp']
例句：
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1.The hydra was a fascinating creature that lived in the ocean.
这个水螅是一种令人着迷的海洋生物。
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2. Hydroids are common in shallow waters and are known for their ability to reproduce quickly.
水螅常见于浅水区，因其快速繁殖的能力而闻名。
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3. Polyps are small, soft-bodied creatures that can be found on rocks and seafloors.
海胆是可以在岩石和海底找到的小软体动物。