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"Ecological conservation concerns the future of the humankind, and it's the common goal of all nations to build a green home," Xi said in the letter.

"Early today a fire broke out inside a mask manufacturing unit here and one person was killed while three others were rescued," a police official said.

"Despite a series of worrying actions taken by North Korea (DPRK) recently, the momentum for dialogue remains unshaken," he added.

"Due to the enthusiastic response, we launched registration for the third expo in August, and have already received many inquiries and reservations," said Zhou Lingyan, deputy general manager of the CIIE exhibition department of the National Exhibition and Convention Center (Shanghai).

"Even though we have spent more than half a year battling a virus whose insidious hallmark is its ability to spread through those with no symptoms, the country has not yet articulated a coherent strategy to test these silent carriers," online media outlet ProPublica said.