Usenet is a very large, distributed BBS (Bulletin Board system), the principle is simple: Every Usenet site ship a copy of all articles it has received to all its neighbors several times a day.

• Usenet是一个庞大的、分散的bbs（电子公告牌系统），其工作宗旨很明确：每天分几次将所有Usenet站点收到“文章”的拷贝传送给相邻用户。