An apology was tagged onto the end of the letter.
信的结尾顺便附了一句抱歉的话。
You owe him an apology for what you said.
你要为你所说的话向他道歉。
He offered us an apology of sorts.
他给我们勉强道了个歉。
My apology seemed to content him.
我的道歉好像使他感到满意。
She wrote a letter of apology but only under protest.
她无奈之下写了一封致歉信。
I must preface my remarks with an apology.
讲话前，我必须先表示歉意。