当你需要将"荣誉证书"用英语表达时，其正式的翻译是"certificate of honor"。这个词组源自法语，常用于正式场合以表彰个人或团体的杰出成就。例如，政府部门在对某人或某团队的卓越贡献进行认可时，会颁发这样的证书作为荣誉证明。

This certificate serves as a testament to the recipient's excellence and is often bestowed by relevant authorities. It is a tangible symbol of recognition and appreciation for their hard work and accomplishments.

因此，当你需要在英文文档、邮件或交流中提及荣誉证书时，可以直接使用"certificate of honor"这一表达方式，确保清晰且正式地传达这一荣誉的象征意义。