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China requires all inbound passengers to provide a negative nucleic acid test result before their flights, its civil aviation regulator said on Tuesday, as part of efforts to curb cross-border spread of COVID-19 amid increased international travel.

China launched the "toilet revolution" in 2015 and has since built or renovated nearly 60,000 toilets. The Plan for Rural Revitalization (2018-22), issued by the central government in September, aims to achieve an 85 percent prevalence of clean toilets in rural areas by 2020.

China remained the largest target of trade remedy measures in 2017, even though the number of cases and value involved declined because of a higher comparative base in 2016, the improving global economy and the fight against protectionism, according to data released by the Ministry of Commerce.

China urges the US to meet it halfway, in line with the recent bilateral joint statement, the spokesperson added.

China may be ranked seventh globally when it comes to the number of professionals working in the cutting-edge industry of artificial intelligence, but the country is predicted to climb the rankings in the next decade.