Both use a two character language and two character country code connected by an underscore.

两者都使用两个字符语言代码和两个字符的国家代码通过下划进行连接。

youdao

Both use a two character language and two character country code connected by an underscore.

两者都使用两个字符语言代码和两个字符的国家代码通过下划进行连接。

youdao