Love your teeth!
本文作者： 21ST
Today is National Teeth-loving Day (全国爱牙日)! Teeth are very important for all of us. How do you take care of yours? How many teeth do you have? 张开嘴巴数一数吧！Everyone has two sets of teeth (两副牙齿) in their life: baby teeth (乳牙) and permanent teeth (恒牙). Children younger... |  |
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