词典释义：
释义
n.
a dispatch of mail, especially advertising and promotional material, to a large number of addresses
（尤指广告和促销宣传品的）统一大量寄发。
an item sent in this way
统一寄发的邮件。
v.
send such material to (a large number of people)
给（很多人）统一寄发。