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Li called on attending experts to join hands in responding to challenges such as serious diseases, an aging population, environmental pollution and resource shortages, so as to promote sustainable development in the global economy and society, and improve the wellbeing of the world's people.

Based on changes in international oil prices, the retail prices of gasoline and diesel will be cut by 510 yuan (about 73.5 U.S. dollars) and 490 yuan per tonne, respectively, according to the National Development and Reform Commission (NDRC).

"The Dominican Republic hopes to promote cooperation with China under the Belt and Road Initiative, in such areas as trade, infrastructure construction, energy, electricity and tourism," Medina said.

Referring to Portugal as a good friend and good partner of China in the European Union, Xi said China and Portugal properly resolved the question of Macao in 1999, setting an example for other nations in tackling issues left over from history through friendly negotiations, and laying the foundation of mutual trust and cooperation for the bilateral relations in the 21st century.

"Since the establishment of diplomatic relations between China and Ukraine, the two countries have made significant achievements in pragmatic cooperation in various fields," said Gao Yan, chairperson of CCPIT.