Workers at Shanghai Pudong International Airport dismantle the barrier of an isolation area on Sunday. That day, China reopened its borders, which have been largely shut for three years, no longer requiring inbound travelers to undergo quarantine and nucleic acid testing. Photo: VCG

Inbound travelers queue at the border control area at Hong Kong’s Lok Ma Chau train station, which connects to Shenzhen. China resumed its cross-border service on Sunday and welcomed the first passengers in three years, as part of restoring normal border controls between the Chinese mainland and Hong Kong. Photo: VCG

Nuns wearing face masks arrive at the immigration counters in the departure hall of Lok Ma Chau station on Sunday. Photo: VCG

Cross-border passengers flock to Lok Ma Chau station. Seven border checkpoints have been opened for the first stage of reopening, with a maximum of 60,000 Hong Kong residents allowed to enter the mainland each day, according to the Hong Kong government. Photo: VCG

A little girl leaves with her parents for Shenzhen at the Lok Ma Chau Departure Hall on Sunday. Photo: VCG

A mother and son who have been separated for three years hug at the Lok Ma Chau Departure Hall on Sunday. Photo: Li Zhihua/China News Service, VCG

On Sunday, employees of a company in East China’s Zhejiang province plan to fly to Frankfurt, Germany, to participate in an exhibition. China also resumed issuing passports and visas for Chinese citizens and foreign nationals on Sunday. Photo: Wang Gang/China News Service, VCG

International travelers arrive at Beijing Capital International Airport from Hong Kong on Sunday. Photo: VCG

Travelers with their luggage prepare to enter Myanmar Sunday through the port of Ruili. It is largest land border crossing connecting China and Myanmar in Southwest China’s Yunnan province. Photo: VCG