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"These pilot free trade zones have accumulated much good experience in the past six years since their launch. In particular, they have set an example in deepening the reform of government functions and expanding opening up," Li said. "There must be a stronger unity of purpose, supported by intensified efforts in this respect."

Over the past 18 years, the SCO has grown into the world's largest regional organization for comprehensive cooperation in terms of both the area it covers and the population it represents. Cooperation among member states has been largely enriched in such fields as security, economy and people-to-people exchanges.

"We have noticed that the Office of the U.S. Trade Representative had made an announcement saying related goods exported from China to the United States prior to May 10 will remain subject to an additional 10-percent tariff if they enter the United States before June 15, 2019," said the office in a statement.

"We urge some Americans to reflect on their actions, abandon ideological stereotypes, and stop spreading prejudiced and old remarks," he said.

BEIJING, June 23 (Xinhua) -- Air quality improved in Chinese cities in the first five months of 2019, according to the Ministry of Ecology and Environment (MEE).