Who is Mr. Lin roaming in the sea?

It is the net name of Lin Wei, the founder of Digital Cloud Information Technology Co., Ltd. Teacher Lin is a well-known Internet educator, and his company shuyun focuses on scientific education and product development in the fields of intelligent hardware and artificial intelligence. "Roaming at Sea" takes high school mathematics as the background and Zhejiang Mathematics College Entrance Examination as the core, presenting novel articles and topics for everyone to exchange.