Shadowing.com can bring videos from YouTube that are suitable for children and students to learn. Videos may be deleted arbitrarily in the following cases. 1. Video unsuitable for language learning through shadowing because there are no subtitles or the subtitles and the speaker in the video are out of sync. 2. Content for adults, violence, weapons, dangerous content (stunts, pranks, challenges that may cause serious physical harm but cannot be easily imitated by minors), inappropriate language, or videos with sensitive subjects may be deleted at will.