An apology was tagged onto the end of the letter.

　　信的結尾順便附了一句抱歉的話。

　　You owe him an apology for what you said.

　　你要為你所說的話向他道歉。

　　He offered us an apology of sorts.

　　他給我們勉強道了個歉。

　　My apology seemed to content him.

　　我的道歉好像使他感到滿意。

　　She wrote a letter of apology but only under protest.

　　她無奈之下寫了一封致歉信。

　　I must preface my remarks with an apology.

　　講話前，我必須先表示歉意。