关于这张图
ISS016-E-008971 (2 Nov. 2007) --- Astronauts Paolo Nespoli (foreground) representing the European Space Agency (ESA), Scott Parazynski (right) and Doug Wheelock, all STS-120 mission specialists, make preparations for the mission's fourth spacewalk in the Quest Airlock of the International Space Station while Space Shuttle Discovery is docked with the station.
