How to add a language available for speech recognition in Search and Assistant?

The Xiaomi smartphones support adding a language available for speech recognition in Search and Assistant, which can help to interact in different language backgrounds with Google Assistant. When using Search and Assistant, multiple language options will bring more convenience and overcome the difficulties caused by language.
To add a language available for speech recognition in Search and Assistant, please refer to the following steps:
1. Go to [Settings];
2. Swipe down to find and tap [Google];
3. Tap [All services];
4. Tap [Search, Assistant & Voice];
5. Tap [Voice];
6. Tap [Languages];
7. Select from the languages.
Note:
The available languages that can be selected have a limit. You cannot select other languages if the limit is reached.