前言： 文章利用“中国高龄老人健康长寿”跟踪调查项目提供的数据，分析了高龄老人牙列完整状况。
Based on the data provided by the CLHLS, the paper analyzes edentulousness among the Chinese oldest-old.
民事登记是国家对其国民的出生、死亡和婚姻状况保持连续和完整记录的方式。
Civil registration is the way by which countries keep a continuous and complete record of births, deaths and the marital status of their people.
哺乳动物的状况最好（它有一个完整的数据库，这让评估变得更容易）。
The news is best for mammals, whose complete dataset has made evaluation easier.
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