noun
travel bubble; travel corridor
A bilateral or multilateral agreement allowing quarantine-free travel between countries or regions during a pandemic. Used in news and policy contexts.
日本とシンガポールの間でトラベルバブルが始まった。
A travel bubble started between Japan and Singapore.
トラベルバブルの条件は、出発前のPCR検査が陰性であることだ。
The condition for the travel bubble is a negative PCR test before departure.