This website is built according to the principle of accessible web design. The main
contents of the website are divided into two main blocks: 1. The upper function
block, 2. central content block.
The accesskeys for this website are set as follows:
Alt + U: the upper right function blocks, including Back to Homepage, Site Navigation,
App Download, Resource Download, Languages, etc.
Alt + C: the main content block is the main content area on this page.
Alt + Z: lower function block.
Alt + S：Search.