关于ETH的推荐信 寻求帮助

是否需要推荐信纸质原版，复印件行不行？因为原版只有一份，发了邮件问小秘小秘一直没有回复、
另外寄的纸质材料还有哪些坑，希望前辈指教

官网都有信息建议仔细看。推荐信需要原件+密封。

坑略多hhhh 申请和入学注册我都二次补材料了，还是按照官网那个checklist仔细准备吧。

这是官网上的要求：Letters of recommendation
The letters of recommendation are handled via online recommendation system which is part of the online application process.
When you are completing the online application form you will be asked to provide the details of your referees, including their email addresses. A request will be sent from the online application form to your referees directly.
Please note that ETH Zurich does no longer accept letters of recommendation via email, mail or included in the application package.
我的理解是在线提交就可以，不用邮寄。

好像是今年开始使用邮件提交推荐信，应该不需要纸质版邮寄。但是其他要求的材料仍然需要邮寄。