名词
中文翻译：螺旋
同义词：
['snail shell', 'spiral']
例句：
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1. The snail's body is covered in a protective layer of calcium carbonate.
蜗牛的身体被一层钙质的外壳保护着。
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2. The spiral staircase leads up to the rooftop.
螺旋楼梯通向屋顶。
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3. The snail's body is used for protection and defense.
蜗牛的身体用于保护和防御。