说明：  帮助业内工程师进一步了解汽车CAN网络应用层协议制定的重要性，以及掌握汽车CAN网络应用层协议设计技术，并解决其关键问题
(engineers to help the industry better understand vehicle CAN network application layer protocol developed the importance of and the master vehicle CAN network application layer protocol design technology, and to address key issues)