The Beijing Winter Olympics is being hosted inside a veritable fortress -- known informally as the "bubble" -- that takes weeks of careful planning to successfully penetrate.
원문출처 : https://www.cnn.com/2022/01/31/sport/winter-olympics-beijing-covid-bubble-spt-intl-hnk-dst/index.html
원문출처 : https://www.cnn.com/2022/01/31/sport/winter-olympics-beijing-covid-bubble-spt-intl-hnk-dst/index.html