这是一个重要的证书。

It’s an important ___certificate.

我需要出示结婚证才能办理手续。

I need to show my marriage ___certificate to complete the procedure.

她完成了培训课程后，获得了结业证书。

She received her ___certificate after completing the training course.

投资前请确保查看这份债券的官方认证文件。

Please check the official ___certificate before investing in this bond.

这个网站的证书确保了数据传输的安全性。

The website's ___certificate ensures secure data transmission.