关于这张图
S115-E-05813 (13 Sept. 2006) --- Astronauts Steven G. MacLean representing the Canadian Space Agency, and Daniel C. Burbank, both STS-115 mission specialists, participate in the second of three scheduled spacewalks for the Space Shuttle Atlantis and International Space Station crewmembers as construction resumes on the orbital outpost. The two STS-115 mission specialists are translating along the side of one of the station's trusses.
