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总结
NASA原定在国际空间站外进行的美国舱外活动在临近开始前被临时推迟，原因是有一名乘组成员出现“医疗方面的关注点”。NASA表示将继续监测其健康状况，并在安全评估完成前不安排出舱；多家媒体称，机构还在评估是否需要罕见地提前将相关乘组送返地球。此次变更可能打乱既定的维护与任务排程，也凸显在轨作业对人员健康与风险控制的高敏感性。
正文
A crew member's "medical concern" foils a planned spacewalk outside the ISS Ars Technica NASA postpones spacewalk to monitor 'medical concern' with astronaut CNN NASA considers rare early ISS crew return due to astronaut's medical issue Yahoo NASA Postpones Spacewalk Just Hours Before Astronauts Were to Exit ISS Scientific American NASA to Preview US Spacewalks at Space Station in January NASA (.gov)
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