Oppo mobile phone can't open Haiyan e-learning, which is a memory problem. Cleaning up garbage, uninstalling unnecessary software, backing up photos and videos and deleting them are all caused by insufficient memory.

The fifth grade of Haiyan e is aimed at; The online education service platform created by all primary school students and teachers can better master what they have learned online, help students plan their own learning plans, conduct targeted online learning and drills, and easily help more students improve their academic performance online, so that they can easily enjoy the best teaching resources in the world on their mobile phones, such as after-school tutoring by famous teachers.