shuttles or cargo rockets. Besides, it's. important as the space station is about to expand from three

　　people living on beard to six.

　　The recycling system had been brought up to the space station last November by space

　　shuttles Endeavour, but it couldn't be used until samples were tested back on earth: So when it

　　came time to actually drink up, NASA made a big deal of it. The -three-man crew stood holding

　　their drinks and congratulated engineers in two NASA centers that worked on the system.

　　"This is something that had been the stuff of science fiction,” American astronaut Michael

　　Barratt said before taking a small mouthful. "The taste is worth trying."

　　The new system takes the combined urine of the crew from the toilet, moves it to a big tank,

　　where the water is boiled off, and the vapor is collected. The rest of the urine is thrown away.

　　Then the water vapor is mixed with water from air, and then it goes through filters（过滤器）．

　　When six crew members are aboard it can make about six gallons from urine in about six hours.

　　“Some people may find the idea of drinking recycled urine distasteful, but it is also done on

　　earth, but with a lot longer time between urine and the tap,” said Marybeth Edeen, the space

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