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总结
NASA表示，因国际空间站一名乘组成员出现“医疗情况/医疗担忧”，原定的2026年首次美国舱外活动在临近开始前被推迟，以便继续监测并评估风险。多家媒体称，NASA还在研究是否罕见地提前结束Crew-11任务、让相关乘组更早返回地球。官方未披露具体病因与人员信息，称当前重点是安全与任务调整，后续将视评估结果更新行走与返回计划。
正文
NASA weighs an earlier end to the Crew-11 mission after a 'medical situation' with an ISS crew member postpones first spacewalk of 2026 Spaceflight Now NASA postpones spacewalk to monitor 'medical concern' with astronaut CNN NASA considers rare early ISS crew return due to astronaut's medical issue Reuters 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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