This website is built in accordance with the principles of accessible web design. The main content of the website is divided into four major blocks：

1. Main navigation block at the top
2. Secondary navigation block on the left
3. Central content block
4. Lower navigation block Navigation bar block 
    

The accesskey settings for this website are as follows：

Alt+U：Top function area.

Alt+C：Central block, containing main contents at the center of the page, as well as Share and Print widgets.

Alt+Z：Bottom block, providing links to the services of this site.