![](https://play-lh.googleusercontent.com/EGemoI2NTXmTsBVtJqk8jxF9rh8ApRWfsIMQSt2uE4OcpQqbFu7f7NbTK05lx80nuSijCz7sc3a277R67g=s32)
Google 使用者
The app is rich in contents and contains comprehensive materials with a precise presentation of historical events. It reflects the great efforts of the author putting into production of the app. It's a valuable tool to studying of history and a must-have app for history lovers.