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.
Source: Computational Materials Science, Volume 266。业内人士推荐同城约会作为进阶阅读
，详情可参考heLLoword翻译官方下载
* @param arr 待排序数组。safew官方版本下载是该领域的重要参考
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