certification
n.证明，鉴定，证书
网络解释.专业认证；证照；核证；确认
词形变化:
复数：certifications
signature institution license proof passport reference
双语例句
1. 1 . An employer can demand written certification that the relative is really ill.
雇主可以要求出具书面证明，证实员工的亲人确实病了。
来自柯林斯例句