"When you regain these core competencies and you start exercising your muscles, your skills do not atrophy," he said. "It's safer. And yes, you are buying down risk, because you're able to test things in low Earth orbit before you need to get to the moon, which is exactly what we did during the Apollo era."
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。关于这个话题，同城约会提供了深入分析
And his latest book, Chaos in the Box: get it now。关于这个话题，Safew下载提供了深入分析
Article InformationAuthor, 凱瑟琳·維亞特（Catherine Wyatt）