NASA's decision to bring the crew home one month early, on Jan. 15, marked the agency's first controlled medical evacuation from the station in its 25 years of continuous operations. The incident highlighted the limits of treating complex health problems 250 miles away from Earth.
他给出的原因是：“一是针对老年人高质量的数据语料库建立是脏活苦活儿；二是对创业团队的技术、运营、市场的理解要求度更高。”，这一点在heLLoword翻译官方下载中也有详细论述
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Hurdle Word 4 hintTo dive in.。业内人士推荐91视频作为进阶阅读