政策原文（可复制链接到浏览器查看）：
日本卫生部官网政策全文：
https://covid19.moph.gov.qa/EN/travel-and-return-policy/Pages/default.aspx#general-policy
https://www.canada.ca/en/public-health/news/2022/02/government-of-canada-lightens-border-measures-as-part-of-transition-of-the-pandemic-response.html
https://www.bundesgesundheitsministerium.de/en/coronavirus-infos-reisende/einreise-sms/entry-sms.html
https://covid19.homeaffairs.gov.au/coming-australia