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NASA Announces Next Generation Spacecraft NASA has unveiled plans for its next-generation, post-Shuttle spacecraft to carry humans into earth orbit and beyond. The state-of-the-art, four-astronaut capsule, called the Multi-Purpose Crew Vehicle or MPC
发表于:2018-12-16 / 阅读(587) / 评论(0)
VOA标准英语2011年(五月)
VOA标准英语2011年(五月)