她无奈之下写了一封致歉信。

She wrote a letter of apology but only under protest.

《牛津词典》

随后他们还寄回了一封致歉信。

They later sent a letter of apology.

youdao

我们给她寄去一封致歉信。

We sent a letter of apology to her.

youdao

昨天我收到了一封致歉信。

I received a letter of apology yesterday.

youdao

我发了一封致歉信。

I sent a letter of apology.

youdao

对此，成都地铁发了一封致歉信，乘客可以在任何一个车站接。

In this regard, the Chengdu subway issued a letter of apology, passengers can receive at any station.

youdao

对此，成都地铁发了一封致歉信，乘客可以在任何一个车站接。

In this regard, the Chengdu subway issued a letter of apology, passengers can receive at any station.

youdao