单词：caulking calking
填隙
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发表于:2018-12-08 / 阅读(33) / 评论(0)
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By David McAlary Washington 12 July 2006 Astronaut Mike Fossum (on arm)installs the International Space Station's railcar-like mobile transporter U.S. space shuttle astronauts are on their third spacewalk since Saturday, this time to practice method
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