covering letter
... covering letter (附于包裹或信件内用于说明或附言的)附信 covering power 遮盖力 protective covering 保护敷层;防护涂层;保护层 ...
covering g letter
... registered d letter 挂号信 covering g letter 附信 to register 挂号 ...
计 trailer block
Enclosing information
Additional information ; Extras ; overhead information ; virtual information