An UpdateNumber is used to identify a particular version of a message.
更新号用来标识消息的特定版本。
2
Cell broadcast messages are classified by topic and allocated a channel number, message code, updatenumber, and language.
小区广播消息按主题分类，给每条消息都分配了通道号、消息代码、更新号和语言。
3
In its latest update on global employment trends, the agency says projections of the number of unemployed people this year range from 210 million to nearly 240 million people.