Yi Yi Books is a translation tool designed to aid users in translating documents and papers. The platform allows users to upload their own documents for translation, as well as provide feedback and improvements on the translation results. A notable feature of Yi Yi Books is its cross-reading functionality, which enables users to compare the translated content with the original text. This feature facilitates a more accurate understanding and improvement of the translation. The platform also offers a user-friendly interface and a range of other features, including chat groups and messaging services. For more information about Yi Yi Books, visit their website or join their Telegram channel.