As a matter of fact, it is often very difficult for adoptees to find out about their birth parents because the birth records of most adoptees are usually sealed.

事实上，被收养者往往很难找到他们的亲生父母，因为大多数被收养者的出生记录通常是被封存的。

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They compared the risk of getting breast cancer with birth size, relying on birth records, parent recall, and self reports.

他们根据出生卡片，父母回忆和自己报告比较患乳腺癌的风险和出生尺寸的关系。

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She has documented the gap by comparing ages from death notices on a poodle email list she belongs to with birth records in a poodle database.

她记录了自己参加的狮子狗俱乐部开出的死亡报告上的狗寿命，将其与一个狮子狗数据库上的出生纪录进行对比核实。

youdao

Also,local governments usually keep official copies of birth, marriage and death records.

VOA: special.2010.06.28

The site's users self-correct data by flagging discrepancies and inaccuracies, and they solve disagreements by presenting evidence like birth records.

WSJ: Using Wikis and Other Forms of Group Research, Family Historians Are Making Surprising Connections

The bill would have required presidential candidates to present their birth certificates or other birth records to be eligible to be on the ballot.

FORBES: Jan Brewer Vetoes Birther Bill, Campus Gun Bill

At that time birth records for chimpanzees were not kept so Wolf did the next best thing: He asked the expert to estimate Little Mama's age.

CNN: Meet one of the oldest chimpanzees in captivity