一下是证明信内容，求鉴定：
To whom it may concern!
I confirm that the only requirements for the registration of Mr. XXX, male, born on XXX, are academic background and acquirements and there is no formal English proficiency check for his registration as PhD student at XXX University. It is left to thesis supervisor to judge whether or not the student’s English level is sufficient.
In our group, most of the research is conducted in English. Based on our contact with Mr. XXX, I confirm that his English level is sufficient to communicate and work in our laboratories.
I wish Mr. XXX all the best for the application.
Yours sincerely,

Prof. XXX，

感觉没啥问题啊

纸质版倒不用，有签名的扫描件就可以，或者电子签名的PDF也可以

谢谢啊。可昨天晚上我已经让外导帮我把语言证明和研究计划的原件邮寄过来了

语言证明写的很合适了，这位外导很好啊，看起来很配合国内这边的申请~

“（六）通过国外拟留学单位组织的面试、考试等方式达到其语言要求（应在外方邀请信中注明或单独出具证明）。 ”，感觉最好应该注明怎样考试的考试时间方式内容等。