www.usatoday.com/story/travel/cruises/2022/03/30/cdc-covid-cruise-travel-risk-assessment/7214943001/
另外一个USAToday的 link,更权威些。
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www.usatoday.com/story/travel/cruises/2022/03/30/cdc-covid-cruise-travel-risk-assessment/7214943001/