yo-yo ['jəʊjəʊ]

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n.溜溜球（一种玩具）

a toy which consists of a circular object that can be made to go up and down a long piece of string to which it is tied

A yo-yo can rise and fall. 溜溜球既可以上升也可以下降。
There are six yo-yos. 有六个溜溜球。