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A transparent plastic sphere in which a hamster or other small pet can run (causing the sphere to roll around) to get exercise.
1970s; earliest use found in Silver City (New Mexico) Daily Press.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。