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笔记：yo-yo transformation 来回转变
yo-yo就是我们平常玩的悠悠球，甩下去又能自己升起来，来回摇摆，所以这个词组就是表示来回的转变。因为经常用到这个比喻意义，yo-yo还可以做个动词。
His weight has yo-yoed in recent years.
他的体重这些年来回变化。
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