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发表于2024-11-11
Sputnik/Explorer I pdf epub mobi txt 电子书 下载 2024
The cold war served as the backdrop of the competition to find out which superpower--the United States or the Soviet Union--could reach outer space first. On October 4, 1957, the Soviet Union launched Sputnik I, and the space race was officially on.
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Sputnik/Explorer I pdf epub mobi txt 电子书 下载 2024