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"China welcomes both domestic and global companies to actively participate in the exhibition and sign more deals," Gao said at a regular news briefing.

"Coupled with the Belt and Road Initiative, the Greater Bay Area development will ensure long-term prospects for Hong Kong's economy," she said, adding that through the two national policies, Hong Kong will enhance its role as a business bridge between the Chinese mainland and the rest of the world.

"Customers can see whether a piece of jewelry suits them by using this app. The app is useful because some pieces are expensive and cannot be worn," said Qian Zhongjie, sales director of AISee JEWEL.

"Citizens should not leave the city when it's not necessary," she said. "The outbound travel should continue to be suspended and large-scale event should not be held."

"China's foreign trade structure was also optimized," Liang said.