谁来帮我翻译一下，谢谢

你的信直译出来可是相当滴肉麻哦 老外的思维习惯和我们不同。
只能意译：
dear sir:

I am so grateful to have been working with you for such a long time, because i have learned a lot from you.
thanks to your trust and guidance to me.as you know, i am not good at expressing in english, but i do hope you can understand how much i cherish the days and hours we have spent together.

please do not worry about our after-sale service, i shall try my best to do it help you in parts of the work.
besides, i am now full of confidence to be a department manger.although many of the staff are of the same age as my uncle,we can get along very well in and out of the work.

the staff and i love you so much from the bottom of our hearts.
hope you'll write us soon.

best wishes !
签名

大小写你自己修改了，如果你给的悬赏分高的话还可以译的更好一些

Dear leaders, teacher, elder:

How are you?

There