This website is designed in accordance with the principle of "Accessible Website Development Specification", the main content of the website is divided into three major blocks:：
1. The function block above the upper part, 2. The central content block, 3. Downfinder block.
This website follows the norms of accessible website design to provide web guide bricks (: :), Site Navigator, keyboard quick key (Access Key). The following is a keyboard quick key (Access Key) operation mode:
Alt+U (IE), Alt+Shift+U (Firefox)：Above the main single joint area.
Alt+C (IE), Alt+Shift+C (Firefox)：Main content display area, this block presents web page content.
Alt+Z (IE), Alt+Shift+Z (Firefox)：Single selection area below.