本软体由安琪艾可科技文化传媒有限公司自主设计，自主研发，自制内容，自有版权。

This software is designed and developed by the Angell Echo Technology Culture Media Co. Ltd which owned the copyright of it.

youdao

本软体由安琪艾可科技文化传媒有限公司自主设计，自主研发，自制内容，自有版权。

This software is designed and developed by the Angell Echo Technology Culture Media Co. Ltd which owned the copyright of it.

youdao