This topic reminds me of my experience of high school. During that period, though we didn't have chance to learn online, we learned together and talked about any problems in person. We wouldn't be annoyed by a hard math problem which was very different from the situation when we learn online. Learning with classmates in the same classroom was really fun , we could help each other to improve our own academic achievement. While learning online, it's not convenient to communicate with others. After class, we always feel sad and helpless when we meet hard problems. The only method we can use to figure out a hard problem is to scan it with an app to search out the answer online, then copy it on paper. So, if we meet the same kind of problem during an exam, we can't figure it out either. But online learning has its own advantages. Compared to my high school time, our kids have opportunities to share many excellent learning resources online, which also promotes teachers to improve themselves in order to avoid being exceeded by their students. So, we need to take advantage of the benefits of online learning and avoid its disadvantages. Just like walking with two legs is better than just using one of them.