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初一版
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第568期
AMAZING BODY
Why do my teeth fall out ?
初一
第568期
作者:TEENS
Aa
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我为什么掉牙?
Everyone has two sets (两副) of teeth. The first set is called baby teeth (乳牙). They start to fall out when we’re about 6 years old. The second set is called permanent teeth (恒牙). Kids lose baby teeth to make room for permanent teeth.
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