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英语翻译Newbom babies do not usually have any teeth.Their front

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英语翻译
Newbom babies do not usually have any teeth.Their front teeth begin to grow when they are about six months old.Most children have all their "milk" teeth by the time they are two years old.there are 20 teeth altogether The front teeth are used to cut food by biting.The back "double" teeth are used to grind up the food.This makes the food easier to swallow.Foods that are sticky and have a lot of sugar in them will make holes in the teeth if the teeth are not cleaned with a brush.The"milk"teeth start to fall out when children are six or seven years old.The new teeth that grow in their place have to last for ever!
英语翻译Newbom babies do not usually have any teeth.Their front
Newbom婴儿通常不会有任何 teeth.Their门牙开始生长时,他们对六个月大.大多数孩子 拥有的时候,他们所有的“牛奶”牙齿 是两岁.总共有20颗牙齿 前牙用于切割食品 咬.背面的“双重”牙齿是用来 磨碎的食物.这使得食品 更易于吞咽.黏性食物,并有很多 其中糖将在牙齿如果洞 牙齿不清理用毛笔.在“牛奶”牙齿开始脱落时 儿童是六,七年old.The新 在他们的牙齿,有地方将持续增长 永远!