Group 1 - The successful ignition of a 90-ton reusable liquid oxygen kerosene engine on December 8, 2024, marks a significant breakthrough in China's commercial space industry regarding reusable rocket engine technology [1] - The successful test of a 140-ton reusable liquid oxygen methane engine on April 26, 2025, signifies a major advancement in the development of China's heavy-lift liquid oxygen methane engines [1] - The new engines are characterized by high thrust, high thrust-to-weight ratio, and reusability, providing essential support for the construction of a space power and commercial rocket launches [1] Group 2 - The China Aerospace Science and Technology Corporation's Sixth Academy has established a working mechanism focused on "technical limits assessment, rapid R&D iteration, and product improvement" to achieve breakthroughs in liquid propulsion technology [2] - The use of 3D printing technology has been emphasized to shorten the development cycle and facilitate the manufacturing of complex structures, with key components incorporating 3D printed parts [2] - The Academy aims to enhance the quality of liquid propulsion development by building an innovative system and fostering new productive forces with liquid propulsion characteristics [2]