名词
中文翻译：环形外壳
同义词：
['ring', 'ringer', 'ring-shaped casing']
例句：
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1. The ringcasing is made of stainless steeland has a diameter of 20cm.
这个环形外壳由不锈钢制成，直径为20厘米。
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2. Thering casing protects the camera lens from scratches.
环形外壳保护相机镜头免受刮擦。
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3. The ring casing isdesigned to fit snugly around thebase of the phone.
环形外壳设计得可以紧密地围绕手机的底部。