The file may contain multiple ca certificates .

该文件可能包含多个ca证书。

In either case , the system uses detail provided by the ca to confirm that the certificate is legitimate .

任何一个例子，系统使用由证书认证机构（ca）提供的细节来确认证书是合法的。

You ca ot cancel the contract without first securing our agreement .

如果没有事先征得我们同意,你们不能取消合同.

Ca they go to the movie ?

他们能去看电影吗？

Galaxy redshift from the ca ii k line .

从钙二及钾谱线得出星系红移。