Core Viewpoint - The development of shield tunneling machines in China has transitioned from reliance on foreign technology to achieving self-sufficiency and becoming a leader in the industry, showcasing the country's advancements in high-end manufacturing [1][3]. Group 1: Development and Achievements - The first domestically produced composite earth pressure balance shield tunneling machine, "China Railway No. 1," was launched in April 2008, marking a significant milestone in China's tunneling technology [2]. - The successful completion of the Tianjin Metro Line 3 project demonstrated the capabilities of domestic shield machines, breaking the monopoly of foreign machines in the Chinese market [3]. - The design and application of hard rock shield tunneling machines were developed to meet the challenges posed by complex geological conditions in regions like Chongqing, leading to significant technological advancements [3]. Group 2: Technological Innovations - The team led by Wang Dujuan has developed several innovative products, including the world's largest rectangular shield machine and the first horseshoe-shaped shield machine, filling gaps in national technology [4]. - The shield machines produced by the company are now widely used in various sectors, including water conservancy, underground space construction, and mining energy, expanding the market for Chinese manufacturing [4]. Group 3: Global Expansion - The export of the "China Railway No. 50" shield machine to Malaysia in 2012 marked a significant step for Chinese tunneling technology on the global stage [3]. - The company has successfully exported shield machines to over 30 countries and regions, establishing itself as a leader in the high-end manufacturing sector [4].