臼齿是口腔内较大的牙齿，同样十分坚韧，分布于左右颊部后端，上下各四颗。
The molars are the largest teeth in the mouth and are also very strong - there are four at the top and four at the bottom.
臼齿是口腔内较大的牙齿，同样十分坚韧，分布于左右颊部后端，上下各四颗。
The molars are the largest teeth in the mouth and are also very strong - there are four at the top and four at the bottom.
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