Can automatically switch to different versions according to the age of the tester, suitable for more scenario applications.
![](http://static03.youjiuhealth.com/web2.0/static/images/productSe/儿童英.png)
![](http://static03.youjiuhealth.com/web2.0/static/images/productSe/成人英.png)
Do you want to know more? Little U can help you solve your questions~