The abrupt shift in strategy was laid out by the space agency’s recently confirmed administrator, Jared Isaacman. Announcing the changes on Friday, he said that Nasa would introduce at least one new moon flight before attempting to put humans back on the lunar surface for the first time in more than half a century, in 2028.
Five tips to help you get your first job
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如果将 iPhone 发布的 2007 年视为智能手机的元年，那么到今天，已经狂奔了近二十年。