Core Insights - The Shenzhou-20 mission successfully completed its third extravehicular activity (EVA) on August 15, with astronaut Chen Dong wearing the space station's extravehicular suit B, which has now supported 20 EVAs, achieving China's goal of "4 years and 20 times" for suit longevity [1] - The suit has been used by 11 astronauts across 8 manned missions, demonstrating stable performance and providing strong support for the operational tasks of the space station [1] - The space station's extravehicular suit has significantly improved functionality and performance compared to the first-generation suits, enhancing longevity, safety, and operational efficiency [1] - As of early 2024, the extravehicular suit is approaching the design limit of "3 years and 15 times" for in-orbit use, necessitating a scientific approach to assess its remaining lifespan [1] - A health monitoring and lifespan assessment plan has been developed to ensure the safety and reliability of the suit during its in-orbit usage [1] - Two new extravehicular suits D and E have been successfully unpacked and tested, ready for future EVA tasks [2]