certificate of public convenience and necessity

例句：

1. 1. The company issued a newcertificate to its employees.
   公司为员工颁发了新的证书。
2. 2. The certificate is valid forone year from the date of issue.
   该证书自签发之日起有效期为一年。
3. 3. Thecertificate was used as proof of identity whenshe applied for her passport.
   当她申请护照时，这张证书被用作身份证明。