英语翻译首先,为我们工作上的疏忽,给您带来的不愉快,我们深表歉意.但请您相信,这只是一次偶然.我们已自省自察,绝不会有第二次.再次致歉!

First, be the negligence that we have worked, Here it is is not happy to bring about , we sincerely express an apology. But ask you to believe that this is only a chance. We already self-examine self examine, will never have second time. Apologize once again!

翻译为First, be the negligence that we have worked, Here it is is not happy to bring about , we sincerely express an apology. But ask you to believe that this is only a chance. We already self-examine self examine, will never have second time. Apologize once again!

First of all, we work for the negligence, to bring you the unpleasant, we apologize. However, you believe that this is just a coincidence. We have self-examination since the review, there will be no way for the second time. Apologize again!
一顶是对的！！

I apologize to your unpleasure by my working neglect,also I hope you can believe it is just an accident.We will self-examination and avoid next time re-happen.Apologize again.

请考虑如下翻译,希望帮得到. :)
First, here we'd like to apologize to you for any inconvinience caused by our carelessness. And we believe that is only an accident and will in no way happen again.
Thank you for your kindly understanding!
Apologize to you again!
(这里to you要有的，用apologize again就是要求对方道歉的祈使句了。。。)
PS:dear 火界 - 经理 四级 , 在句子的成分上请再稍做留意.

First of all, it's our negligence.we are sorry for the inconvience. However, i can assure you that it is just an exception. we won't let it happen for the second time. Apologize again!

First of all,we work for the negligence,to bring you the unpleasant,we apologize.However,you believe that this is just a coincidence.We have self-examination since the review,there will be no way for the second time.Apologize again!

First ，we are so sorry for our negligence of our job,it's an occasional accident,we can ensure you it won't be happen any longer.Apologize to you again!