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China spent 801 billion yuan on railway projects and put 3,038 km of new tracks into operation in 2017, meeting its annual targets of 800 billion yuan of investment and 2,100 km of new lines, according to the China Railway Corporation.

China produces around 80 percent of the world's supply of rare earths. However, the country's rare-earth industry faces problems such as smuggling, illegal mining and production, lack of innovation and environmental protection issues.

China stands ready to work closer with the UN in a variety of areas, thus contributing more to world peace and prosperity and building a community with a shared future for humanity, he said.

China is willing to work with the Czech Republic to elevate the bilateral strategic partnership to a new level by grasping the historic opportunity of jointly building the Belt and Road, Xi said.

China plans to expand infrastructure investment in 2019, with 800 billion yuan going to railway construction and 1.8 trillion yuan going to road construction and waterway projects.