Dear Bob,I am writing the letter to inform you that I wish to express my sincere apology to you.

鲍勃：我写这份信是为了想你表示真诚的歉意。

To begin with,I take this opportunity to extend my heartfelt appreciation to the kind assistance you render me during my stay in Canada.

首先，我想借这次机会对我在加拿大期间你给予我的热心帮助，表示衷心的感谢。

What's more,I borrowed one CD of Beethoven's symphonies from you in Canada.

其次，在加拿大时，我想你借了一张贝多芬交响乐的CD.

Unfortunately,when I returned home,I found to my surprise that CD in my personal baggage due to my carelessness.

然而，当我回家后，我惊奇的发现，由于我的粗心大意，那张CD在我的个人行李中。

To solve the problem,I would like to send this CD to you by express Mail Service.

为了解决这个问题，我想用特快邮政专递把这张CD寄给你。

Once again, please accept my sincere apology for any inconveniences that I have caused.

对于我所造成的任何不便，我再次表示真诚的道歉。

I hope the settlement of the matter will meet your wishes.

我希望这个解决办法能使你满意。

Yours sincerely, Li Ming

您真诚的，李明