关于这张图
iss063e034013 (July 1, 2020) --- NASA astronaut and Expedition 63 Flight Engineer Bob Behnken works during a six-hour and one-minute spacewalk to swap an aging nickel-hydrogen battery for a new lithium-ion battery on the International Space Station's Starboard-6 truss structure. Behnken is pictured holding a pistol grip tool he used to remove and attach bolts that hold the batteries in place.
