He fired off a letter of complaint.

他奋笔写了一封投诉信。

《牛津词典》

She expressed her disgust at the programme by writing a letter of complaint.

她写了封投诉信，表示对这个节目的反感。

《牛津词典》

He stormed into the office, flourishing a letter of complaint.

他挥舞着一封投诉信冲进了办公室。

youdao

Mr Foster, a trustee of Auckland Castle, has written a letter of complaint about the proposed sale to the church commissioners.

BBC: Church plans art treasure sale

He sent a letter of complaint to his archdiocese, copying in the Vatican but bypassing Cardinal Ortega, according to people familiar with the letter.

WSJ: Two Clerics Differ on Cuban Reform

The live music company has filed a letter of complaint to The Royal Parks raising "serious concerns" about the tender and bid process for the new four-year contract up to 2017.

BBC: Live Nation may end 10-year link with Hyde Park