If a single value is provided, the language identifier defaults to a language determined by the registry at the time the publisher account was created, typically English.
如果提供的是一个单值，那么语言标识符缺省为创建发布者帐户时注册中心决定的语言，通常为英语。
2
In this case, you'll stick to a single Integer field which will be used as a unique identifier and enable you to track the progress of a message through the grid.