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Bukele has pledged to fight corruption and break the domination of the two-party system.

But China has very limited proven reserves of iron ores. A long time span, a vast amount of investments and a predictable and stable business environment are needed to successfully tap overseas iron ore resources.

But 2017 appears to be a turnaround for the company. During the first quarter, sales revenue of CRRC Qiqihar reached 940 million yuan (7 million), up 84.31 percent from a year earlier. The company maintained and repaired a total of 2,550 freight cars between January and March.

Buildings in Beijing's Guomao area are enshrouded by rain clouds on Thursday afternoon. Shen Gang/China Daily

Bulgaria attached great importance to the prospects, related to the 16+1 mechanism of cooperation between China and Central and Eastern European countries and the implementation of the Belt and Road initiative, as well as the European Union-China Connectivity Platform, Yotova said.