为确保在 100 毫秒内获得可见响应，RAIL 的准则是在 50 毫秒内处理用户输入事件。根据 Jakob Nielsen’s work on response time limits 提出的三个阈值，1 秒大概是用户思想流保持不间断的极限，即使用户会注意到延迟。
>Cross-border e-commerce brings opportunities to inland China city跨境电商助力中国内陆城市外贸发展A freight train carrying containers for export departs fro
Artificial intelligence ， in its broadest sense， is intelligence exhibited by machines， particularly computer systems. It is a field of research in computer science that develops and studies methods and software that enable machines to perceive their environment and use learning and intelligence to take actions that maximize their chances of achieving defined goals. Such machines may be called AIs.
