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幼儿在园午睡时,我经常听到牙齿咬得咯吱咯吱的响声,后来在与家长的互访中得知这些孩子在家晚寝时也有这种现象。到底是怎么回事呢?我经过
When I was in the park for a nap, I often heard creaks of teeth that I later heard from my parents when I learned that these children were late at home. What happened? I passed