The proportion of elderly patients is increasing from year to year because people are keeping their teeth longer nowadays.
由于目前人们的牙齿寿命更长，因此老年患者的比例逐年增长。
The proportion of elderly patients is increasing from year to year because people are keeping their teeth longer nowadays.
由于目前人们的牙齿寿命更长，因此老年患者的比例逐年增长。
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