详细解释:【计】 套用信函
英语解释：
名词 form letter:
a letter that is printed in multiple copies and mailed to a list of recipients例句：
In word processing, a program for producing form letters in which a name and address file is merged with the text file containing the letter.在字(词)处理技术中，用于产生形式化的信件的一种程序，这种信件是把含有姓名和地址的文件与含有信件正文的文件合并而成的。