This site is based on the principles of web design principles, the main content of the site is divided into three blocks:
1. The top of the web page
2. The center of the web page
3. The bottom of the web page
The accesskey for this website are set as follows:
Alt + U：The top of the functional blocks, including language version selection, the main menu and so on.
Alt + C：Central content block, this block presents the main content of the page.
Alt + B：Bottom block.