关于这张图
ISS020-E-021866 (18 July 2009) --- Astronauts Dave Wolf (in spacesuit with back to camera) and Tim Kopra (out of frame) are suited and just about ready to exit the International Space Station's Quest airlock to begin the first of five scheduled spacewalks over the next several days. The space walkers are assisted here by astronauts Christopher Cassidy (left), STS-127 mission specialist, and Mike Barratt, Expedition 20 flight engineer.
