yo-yo [ˈjoʊjoʊ] n. 溜溜球
英英解释（柯林斯词典）：
A yo-yo is a toy made of a round piece of wood or plastic attached to a piece of string. You play with the yo-yo by letting it rise and fall on the string.
yoyo的特点：
溜溜球是一种玩具（A yo-yo is a toy）用圆木或塑料制成的（ made of a round piece of wood or plastic）系在一根绳子上（attached to a piece of string）你玩溜溜球时，让它在绳子上起落（You play with the yo-yo by letting it rise and fall on the string.）单词选自：
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根据艾宾浩斯记忆原理，请复习单词：