!!! Because one Flutter issue causes APP to always crash if you need I can send you "the debug version" to avoid crash happen, wait for Flutter to fix this issue but it will take a long time. !!!
You can play YouTube videos in APP and seek video time to the sentence.
* Short tap will copy the word to the clipboard, you can install any favorite dictionary APP to look up word meaning quickly.
* Long tap will tag this word is learned or not.