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如果你在国外并计划返回美国，查看 http://travel.state.gov 网站并与航空公司确认是否需要COVID-19阴性检测结果才能登机。旅行要求随时可能更改，在智行者登记计划（STEP）注册，以便收到更新信息。https://step.state.gov
了解更多信息，还可参考美国疾病控制与预防中心常见问题（FAQ）页面，了解有关所有赴美航班乘客需要COVID-19阴性检测结果或COVID-19康复证明的要求：
https://www.cdc.gov/coronavirus/2019-ncov/travelers/testing-international-air-travelers.html
If you're abroad and plan to return to the US check http://travel.state.gov and with your airline to see if a negative COVID-19 test is required to board. Requirements for travel are changing quickly. Register in STEP to receive updates: https://step.state.gov
For further information, please also see the U.S. Centers for Disease Control and Prevention’s Frequently Asked Questions (FAQ) page on the requirement for proof of negative COVID-19 test or recovery from COVID-19 for all air passengers arriving in the United States:
https://www.cdc.gov/coronavirus/2019-ncov/travelers/testing-international-air-travelers.html