Neil sent him a letter of condolence.

尼尔给他发了一封吊唁信。

《柯林斯英汉双解大词典》

He drafted a letter to the editors.

他草拟了一封给编辑的信。

《柯林斯英汉双解大词典》

She composed a letter of protest.

她写了一封抗议信。

《牛津词典》

Sony sent a long(ish) letter to a Congressional subcommittee yesterday ( view it here), but it is still rather lacking on specific advice.

FORBES: Sony Response to PlayStation Security Breach Abysmal

Late yesterday, Senators Ben Cardin (D-MD), Barbara A. Mikulski (D-MD), Frank Lautenberg (D-NJ), Robert Menendez (D-NJ), Mark Warner (D-VA) and Jim Webb (D-VA) wrote a letter to House Speaker John Boehner (R-OH), Senate Majority Leader Harry Reid (D-NV), House Democratic Leader Nancy Pelosi (D-CA) and Senate Minority Leader Mitch McConnell (R-KY), urging the use a pro forma session of Congress in order to offer a solution.

FORBES: Airline Taxes, Job Cuts Tied to Fights Over Subsidies and Unions

Henry Waxman ( CA) and Bobby Rush (IL) wrote a letter to Chair of the House Committee on Energy and Commerce Fred Upton (R-MI) calling for hearings on an asserted link between Hurricane Sandy and global warming.

FORBES: Harry Reid, Shawshank Redemption, And The Invention Of A Phony Global Warming Scare