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China is working on next-generation bullet trains with a maximum speed of 400 km per hour. They will be ready by 2020 for markets linked to the Belt and Road Initiative. A train recently left Beijing for Xuzhou in East China's Jiangsu province with a top speed of 350 km per hour.

China must coordinate domestic and international factors and pursue development while ensuring security to resolve all kinds of risks in the upcoming 14th Five-Year Plan (2021-25) period, Ning said.

China supports Serbia in taking a leading role in setting up a China-Central and Eastern Europe transportation infrastructure cooperation center, expecting Serbia to play a greater role in infrastructure, energy, and education.

China saw a lowering of external debt between late 2014 and the first quarter of 2016, as Chinese firms repaid more debt to reduce risks, the official said.

China started to import solid waste as raw materials to make up for the domestic shortage of resources in the 1980s, but some companies have illegally smuggled "foreign garbage" into the country for profit, damaging the environment and public health.