名词
中文翻译：环套器
同义词：
['ringer', 'ringer', 'ringer-in']
例句：
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1. Thering doffer is used to control therotation of the wheel.
环套器用于控制轮的旋转。
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2. The ring dofferwas designed to improve the accuracy of themeasurement.
环套器被设计用来提高测量的准确性。
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3. The ring doffer was usedto test the strength of the material.
环套器被用来测试材料的强度。