名词
中文翻译：水螅
同义词：
['hydra', 'hydrozoan']
例句：
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1.Amblycera are fascinating creatures that can change color and shape to blend in with their surroundings.
水螅是一种迷人的生物，它们可以改变颜色和形状，以融入周围的环境。
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2. The amphibians are important for maintaining aquatic ecosystems.
两栖动物对于维持水生生态系统至关重要。
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3. The hydra has been used as a symbol of immortality in many cultures.
水螅在许多文化中被用作不朽的象征。