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总结
多家媒体报道，NASA因一名在国际空间站执行驻留任务的航天员出现“医疗担忧”，已推迟原定的舱外太空行走，并对其健康状况进行持续监测与评估。报道称，NASA同时在研究是否需要采取罕见措施，让相关乘组提前结束在站任务并返回地球，以降低安全风险并确保人员健康。此举可能影响空间站近期维护作业与科研计划安排，但NASA尚未公开具体病情、风险评估结论及可能的返航时间表等细节。
正文
NASA considering bringing astronauts home early from International Space Station due to medical issue Space NASA postpones spacewalk to monitor 'medical concern' with astronaut CNN A crew member's "medical concern" foils a planned spacewalk outside the ISS Ars Technica Expedition 74 Ready for Thursday Spacewalk and Continuing Research NASA (.gov) NASA considers rare early ISS crew return due to astronaut's medical issue Reuters
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