I heard that there are many knowledgeable and experienced teachers on the internet, who sometimes will have class for free, even they will open one by one class.

我听说在互联网上有很多知识渊博、经验丰富的老师，而且他们的课有时候是免费的，甚至他们有时会一对一的开班。

youdao

I heard that there are many knowledgeable and experienced teachers on the internet, who sometimes will have class for free, even they will open one by one class.

我听说在互联网上有很多知识渊博、经验丰富的老师，而且他们的课有时候是免费的，甚至他们有时会一对一的开班。

youdao