closed loop 閉環

closed loop
繁：閉環
简：闭环

整個計劃的核心就是「閉環」系統——當中估計有6萬名運動員、代表團官員、媒體、志願者等等所有人。

北京冬奧：體驗奧運閉環內的特殊生活（2022年2月4日）。BBC 中文，取自https://www.bbc.com/zhongwen/trad/sports-60242097

The athletes have arrived, competition has begun and Friday’s spectacular ceremony opened the 2022 Winter Olympics in Beijing. But for the athletes and the others attending, this year’s Games will be markedly different from those that came before. Participants and foreign visitors will be kept inside what organizers call the “closed loop.” 

Enter the ‘closed loop’: What life is like for Olympians in Beijing amid Covid concern. (2022, Feb 6). NBC News. Retrieved from https://www.nbcnews.com/news/world/bejing-winter-olympics-organizers-set-closed-loop-keep-covid-rcna14944