解释信，求翻译成英文，正式地道点为好

Question

首先非常感谢贵校在申请签证过程中给予的帮助，但现在我只能遗憾的决定放弃这次交换留学的机会。
这次签证申请因资料不全所以未能通过大使馆审核，现在贵校已开学，若重新申请至少还要花一个多月的时间，势必耽误不少课程。所以现在我只能遗憾的决定放弃这次机会。由此造成的不便，我感到万分的抱歉。特此奉上这封解释说明信以表达我的歉意。

Answer 1

First of all thank your school in the process of applying for a visa for their help, but now I can only regret the decision to give up the chance to study in exchange.
The visa application failed to pass due to incomplete data so the embassy audit, now school has started, re-apply if they have to spend at least a month's time, is bound to delay a lot of courses. So now I can only regret the decision to give up this opportunity. Inconvenience this may cause, and I am very sorry. Hereby offer an explanation to this letter to express my apologies.首先非常感谢贵校在申请签证过程中给予的帮助，但现在我只能遗憾的决定放弃这次交换留学的机会。
这次签证申请因资料不全所以未能通过大使馆审核，现在贵校已开学，若重新申请至少还要花一个多月的时间，势必耽误不少课程。所以现在我只能遗憾的决定放弃这次机会。由此造成的不便，我感到万分的抱歉。特此奉上这封解释说明信以表达我的歉意。

Answer 2

First of all thank you very much for the given in the visa application process for help, but now I can only regret the decision to abandon the exchange study abroad opportunities.

The visa application because of incomplete information and failed to pass the embassy audit, now you have school, if re apply would take at least a month, will lose a great deal of course. So now I can only regret the decision to give up the chance. The inconvenience, I am very sorry. We are sending this letter to explain the letter to express my apology.

Answer 3

???什马意思追问

就是将我打的内容翻译为英文，因为是给学校的解释道歉信，所以希望翻译时用词正式些，让他看到我道歉的诚意。