The ratios of these element forms change with climate and local geology. Like tree rings, human teeth record this signature year by year and can be used to narrow down a person's native region.
这些元素因为气候和当地地理而改变的比率像树年轮一样，人类的牙齿同样年复一年的记录着这些特征，这常常可以用来限定一个人的出生地。
The ratios of these element forms change with climate and local geology. Like tree rings, human teeth record this signature year by year and can be used to narrow down a person's native region.
这些元素因为气候和当地地理而改变的比率像树年轮一样，人类的牙齿同样年复一年的记录着这些特征，这常常可以用来限定一个人的出生地。
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