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China and the United States, both veto-wielding permanent members of the UN Security Council, have no option but to collaborate as the world is beset with challenges and disorder, including rising protectionism and populism, the lingering impact of the 2008 global financial crisis, and the spread of terrorism and refugee crises.

China adopted new rules last year to raise environmental requirements on solid waste from gold prospecting, leading to a wave of gold mine closures and output declines in major producing provinces, including Shandong, Jiangxi and Hunan.

China Mobile earlier announced its plans to roll out 30 varieties of 5G devices, including a 5G smartphone. China Unicom said its 5G commercial network will be completed in the third quarter of next year, and China Telecom has cooperated with Huawei to establish a 5G testing network, with speeds reaching 1GB per second, in Fuzhou, Fujian province.

China also signed a memorandum of understanding in service trade with Panama on Monday.

China aims to increase its total railway cargo volume by 30 percent from 2017 level to reach about 4.8 billion tons in 2020, a three-year government action plan unveiled last year said.