第三人称单数：covering letters
1. 附信(与包裹或另一封信一起寄出)
A covering letter is a letter that you send with a parcel or with another letter in order to provide extra information.
covering letter在线翻译
3. 七彩网·英语单词大全
1. 七彩网.英语单词
\u0039\u0031\u0031\u67E5\u8BE2\u00B7\u82F1\u8BED\u5355\u8BCD
1. a letter sent along with other documents to provide additional information
Synonym: cover letter