“發現號”宇航員進行最後一次太空行走

American astronauts Steve Bowen and Alvin Drew are taking the last of two spacewalks of the final mission of the U.S. space shuttle Discovery, which is docked at the International Space Station.

The two men are working on a broken pump and doing other maintenance work on an outside storage area. They completed a six-and-a-half hour spacewalk on Tuesday.

Discovery undocks from the space station Sunday for the two-day journey home. First launched in 1984, this is Discovery's 39th and final mission.

When it is retired,Discovery is expected to be placed on exhibit at the Smithsonian's National Air and Space Museum in Washington, or at its annex location just outside the U.S. capital.

美國“發現號”航天飛機的宇航員史蒂夫.鮑文和阿爾文.德魯正在進行兩次太空行走中的第二次，也是最後一次。正在執行最後一次使命的“發現號”航天飛機目前停靠在國際空間站。

兩位宇航員正在修理一個損壞的泵，並進行存儲區域外的其它維護工作。他們星期二完成了6個半小時的太空行走。

“發現號”將於星期日脫離空間站踏上兩天的歸途。自從“發現號”1984年首次升空後，這是它的第39次，也是最後一次使命。

“發現號”退役後預計將被安放在美國首都華盛頓的史密森國家航空航天博物館或在首都以外的其它地方展出。