How to use the course Internet connection：

（1）iPhone/iPad users can access the course offline with the iOS app "Teachable Online Courses." Apple App Store (China)：https://itunes.apple.com/cn/app/teachable-online-courses/id1177062376

（2）Users on Android or other platforms can download the MP4 files of videos manually. Below each video, you will find a "Download" button. Right click on it, and choose "Save as..." to save the video to your local disk.