Group 1 - The article highlights the achievements and dedication of Yuan Yu, a skilled welder and technician at Chongqing Construction Non-Destructive Testing Company, emphasizing the importance of labor and craftsmanship in contributing to national development [1][8]. - Yuan Yu has obtained 11 special equipment operation certificates and has become one of the few young technicians capable of welding in high-risk industries such as chemical, military, and aerospace [2][4]. - The article details Yuan Yu's commitment to continuous learning and skill improvement, including his participation in various competitions and his innovative contributions to welding technology, which have resulted in significant cost savings for projects [4][6]. Group 2 - Yuan Yu's successful completion of a challenging project involving a 12-meter diameter, 25.5-meter high salt tank demonstrates his technical expertise and ability to tackle complex tasks [3]. - The article discusses the importance of welding robots in addressing the shortage of skilled welders and improving efficiency, quality, and material utilization in the industry [6]. - Yuan Yu's role as a mentor and trainer for over 4,800 welders, achieving a 99% pass rate for trainees, underscores the significance of knowledge transfer and skill development in the workforce [7][8].