在世界各地各个知识宝库，存放几十万件内容，可自由获取，用于数千个小时的学习。

There are hundreds of thousands of pieces of content representing thousands of learning hours which are freely available in repositories all over the world.

youdao

在世界各地各个知识宝库，存放几十万件内容，可自由获取，用于数千个小时的学习。

There are hundreds of thousands of pieces of content representing thousands of learning hours which are freely available in repositories all over the world.

youdao