The unique function of win7 multi-language interface

multi-language interface is a function only available in win7 flagship version, and win7 professional version and the like does not have this function. So what is the use of multi-language interface?
1
The use of multi-language interface:
Generally speaking, English is the default language of win7, and Chinese is also a language. If you have a multilingual interface then you can use the language of 33 countries. That is to say, you can add languages ​​from many countries.
2
Is the multi-language interface useful?
This feature is useless for most people, because many times we only use Chinese. So there is no such effect at all.
3
Description of this function
If there is no secret in your computer, even if you destroy it, you can't be seen by others, such as the photo of XX, and you will not know the foreign language of 33 countries. Then the features of Windows 7 Professional can meet all your needs.