This aerial photo taken on Jan． 10， 2023 shows a container terminal at the Tianjin Port in north China＇s Tianjin． （Xinhua／Zhao Zishuo）

TIANJIN， Jan． 15 （Xinhua） －－ People＇s social and economic activities gradually return to normal in north China＇s Tianjin after China＇s optimization of its COVID－19 response measures．

This aerial photo taken on Jan． 10， 2023 shows the Haihe River bridge， an important channel of freight transport， in Binhai New Area of north China＇s Tianjin． （Xinhua／Zhao Zishuo）

People watch a performance at a large commercial complex transformed from an old thermal power plant in north China＇s Tianjin， Jan． 1， 2023． （Xinhua／Sun Fanyue）

This aerial photo taken on Jan． 8， 2023 shows the Jizhou International Ski Resort in north China＇s Tianjin． （Xinhua／Sun Fanyue）

Employees work at an assembly line of the north China base of FAW－Volkswagen in north China＇s Tianjin， Jan． 11， 2023． （Xinhua／Zhao Zishuo）

This aerial photo taken on Jan． 5， 2023 shows the construction site of a photovoltaic （PV） power project in north China＇s Tianjin． （Xinhua／Li Ran）

People enjoy snacks at a fair in Jizhou District of north China＇s Tianjin， Jan． 12， 2023． （Xinhua／Li Ran）

Passengers go through ticket gates at Tianjin West Railway Station in north China＇s Tianjin， Jan． 7， 2023． （Xinhua／Li Ran）

People attend a promotion event for fruits from Vietnam in north China＇s Tianjin， Jan． 13， 2023． （Xinhua／Zhao Zishuo）

This photo taken on Jan． 10， 2023 shows the view of Tianjin Binhai International Airport in north China＇s Tianjin． （Xinhua／Zhao Zishuo）