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总结
NASA表示，因国际空间站（ISS）乘组出现一项未披露的医疗问题，机构正在评估让乘组提前返回地球的方案。该决定的讨论发生在NASA取消原定周四进行的出舱行走任务数小时后。若最终实施提前返航，可能导致站上工作节奏与科学实验安排调整，并凸显在轨健康监测、风险评估与应急处置对载人航天任务连续性的影响。
正文
NASA is considering an early return of the crew of the International Space Station over an unspecified medical issue, hours after cancelling a planned spacewalk that had been scheduled for Thursday, the agency said. Workers pressure wash the logo of NASA on the Vehicle Assembly Building at the Kennedy Space Center in Cape Canaveral, Florida, U.S., May 19, 2020. REUTERS/Joe Skipper
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