Indeed, there are quite a few distance education apps recently, such as Talkline, Distance Education, 12320, etc. There are many kinds, but some of them are complicated to operate, expensive and not practical. One of the apps I've been using recently is the CS scanning universal king, which is a mobile phone scanner and a management tool for scanning documents. It can scan, save and archive, upload and find related content anytime and anywhere, and instantly convert pictures into text through OCR technology. ! !