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SHIJIAZHUANG, Dec. 11 (Xinhua) -- As China seeks to curb air pollution and win the battle for blue skies, more Chinese cities have switched from coal to geothermal heating during this year's winter heating season, as part of their efforts to become "smokeless cities."

China would like to discuss trilateral cooperation with Europe and Germany and promote the synergy of the Belt and Road Initiative with the EU-proposed connectivity plan, said Xi, adding that China will further cooperate on the China Railway Express with Germany and countries along the route.

Noting the tradition of studying history within the Party, Xi called for greater attention to valuing, researching and learning the lessons of history.

A series of activities including a review of ships, a photo exhibition to review patrol achievements over the past seven years and an information exchange meeting about curbing crime on the Mekong River, were also held during the five-day event.

The Communist Party of China (CPC) and the government should build and maintain a sound institutional environment and provide preferable services and regulation to support innovation and stimulate market vitality, he said.