dear_____,
i am writing this letter to express my apology that ______________.i feel terribly sorry about this. once again, i am very sorry for any inconvenience caused. i will be really
appreciated if you can accept my apologies and understand my situation.yours sincerely
_________
亲爱的._____，（对方姓名）我写这封信以表达我的道歉 ______________（道歉原因）。对此我深感抱歉。我再次对给您造成的任何不便深感歉意，希望您能理解我的处境并接受我的道歉。 谨启
_________（自己姓名）