I admire Mr. Li Yongle very much. I think his sharing of popular science videos is very helpful for primary and middle school students to learn scientific knowledge. He lets children all over the country share the resources of famous teachers in famous schools. What he does is very meaningful. He is a person of value to the country and society. So what's the difference between Li Yongle's b station version and Tencent's classroom? He
September 22 one hundred and ninety-three
