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"That could be explained by either dark matter or an astrophysical source. If we use dark matter to explain it, dark matter would be different from what we thought before. It conforms to the popular dark matter model of weakly interacting massive particles (WIMP), but has some special features," Bi said.

The research center is to act as a think tank specializing in consulting services in the field of transport infrastructure for CEE countries, University of Transport rector Daniela Todorova said at the signing ceremony.

While having confidence in its own path, China has always respected the choice of other countries, said Shiferaw Tekle-Mariam, head of Secretariat of the Council of Ethiopian People's Revolutionary Democratic Front.

Beijing plans to cap its population at 23 million by 2020 to address "big city problems," such as traffic congestion and pollution.

"However, some departments have taken little action during the year," he continued. "The major responsibilities of each department should be written into the law."