名词
中文翻译：水螅
同义词：
['hydra', 'hydroid例句：1. Hydroxylapatite is a mineral that can be found in many different environments.（羟基磷灰石是一种可以在多种环境中找到的矿物。）2. 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。）']
例句：
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1. Hydroxylapatite is a mineral that can be found in many different environments.
羟基磷灰石是一种可以在多种环境中找到的矿物。
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2. 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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3.Hydroxylapatite is often used in dental fillings to strengthen teeth.
羟基磷灰石常用于牙科填充物中，以增强牙齿。