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.
除夕夜，福建沿海的天还没完全黑透，鞭炮就一挂接着一挂响起来了，红纸屑铺满水泥地。有人按照习俗，在门前燃起干柴堆，炭火噼啪作响，火苗蹿得老高。
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An unsatisfiable formula is: