麻烦帮忙写一份英文邮件？

对不起又一次打扰您，首先，非常感谢你上一次愿意为我写推荐信，但是由于申请提交的太晚，我没有被录取。所以我决定再一次申请明年入学。非常抱歉又一次麻烦你，希望你能再帮我写一次推荐信。

但是如果你觉得麻烦不想写的话，我也可以理解并且仍然感谢你。

Sorry to disturb you again, first of all, thank you very much for your last time to write a letter of recommendation for me, but I was not admitted because the application was submitted too late. So I decided to apply again next year for admission. I am very sorry to trouble you again, I hope you can write a recommendation letter for me again.

But if you feel trouble and don't want to write, I can understand and still thank you.