OPTIONAL - if the peer SSL client sends a certificate, the certificate is processed as normal but authentication does not fail if no certificate is sent.

OPTIONAL——如果对等ssl客户端发送一个证书，则该证书被正常处理；如果该客户端不发送任何证书，验证并不失败。

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Each certificate from a given certificate authority is unique.

来自给定证书颁发机构的每个证书都是唯一的。

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You will also need to provide copies of evidence that your spouse has been a U.S. citizen for at least 3 years, such as his or her birth certificate, certificate of Naturalization, or U.S. passport.

你还需要提供能够证明你的配偶已取得美国国籍满3年的材料，如配偶的出生证，申请美国国籍成功的证明，或者美国护照。

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Or they can train for a job for a year or two and get a certificate.

VOA: special.2009.06.18

So she got a certificate at the end thanking her for participating in the clinical trial, and also telling her to go get the real vaccine because she hadn't had it yet.

试验最后,她得到了一个证明其参与,这项临床试验的证书,并且被告之要去注射真的疫苗,因为她还没有被注射过

耶鲁公开课 - 生物医学工程探索课程节选

"In summary,the man calling himself Barack Hussein Obama has no real birth certificate issued by the United States," the man said in an Internet video blog.

VOA: standard.2009.08.17

Sandra Katz gathered her birth certificate, University of Iowa diploma, marriage certificate and other documents to build the case for citizenship.

WSJ: Citizenship via Grandparents

Enable families of people missing presumed dead to get a certificate to that effect, with equal legal force to an ordinary death certificate.

BBC: Bill-by-bill: Guide to MPs' private members' bills

For instance, before the bank issues a certificate, the bank snail-mails a document containing unique information the customer must use to activate the digital certificate.

CNN: Technology - E-Signature Act may drive demand for authentication technology