His difficulties are an indication of a wider freeze in the US labour market, where job openings and hiring rates have dropped to multi-year lows.
NASA leaders said the shakeup is meant to address a larger underlying problem: the U.S. agency is flying its most powerful rocket too infrequently and repeating some of the same technical issues from one mission to the next.，详情可参考谷歌浏览器【最新下载地址】
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