关于这张图
ISS020-E-024163 (24 July 2009) --- Astronauts Mike Barratt (top center), Expedition 20 flight engineer, and Dave Wolf (bottom center), STS-127 mission specialist, assist astronaut Tom Marshburn (left) and Christopher Cassidy following the completion of the fourth spacewalk for the joint shuttle-station crews currently aboard the International Space Station while it is docked to the Space Shuttle Endeavour.
