ESYB

If you are iPhone and iPad owner,you now can download ESYB for free from Apple Store. The application is designed for use in English language. It is a whopper, weighing in at 6303744, so make sure you have plenty of free space on your iOS device. The new ESYB app version 2.3 has been updated on 2016-04-04.
Bottom Line: For more information about ESYB check developer Xiuzhang Liu`s website : http://blog.csdn.net/hong9471