Based on the dental enamel's C-14 ratio, they calculated that the victim had been born between 1955 and 1961.
根据牙釉质的碳14比率，他们推算出受害人生于1955年至1961年间。
2
Smokers get periodontal disease at two to three times the rate of nonsmokers, "says Sally Cram, DDS, a periodontist in Washington, D."C., and a consumer advisor for the American Dental Association.
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