Yo Wants to Know (17)

Yo Wants to Know (17)

蟋蟀童书

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内容简介
爸爸用鸡蛋、牙膏和醋给Yo做了一个钙流失试验。你想知道牙膏起到了什么作用吗?快去看看吧!
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Yo Wants to Know (17)