说明：  CAN总线现在是流行的工业用总线形式。然而CAN协议是的英文，给我们中国读者研究带来了诸多不便。本文是CAN协议的中文版，大家一定可以用到
(CAN Bus is now a popular form of industrial bus. However, CAN protocol is in English, study Chinese readers to give us a lot of inconvenience. This is the Chinese version of CAN protocol, all will be able to use)