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The forum attracted about 400 participants from 18 countries and regions. It included four major topics for discussion.

A merger of black holes with an extremely strong gravitational field can not generate ejecta or electromagnetic phenomena, according to Wu Xuefeng, a researcher with the Purple Mountain Observatory of the Chinese Academy of Sciences.

He said over 4,000 tonnes have already been handed over to the South Sudanese government, with the remaining expected to be completed before the end of the year.

"The Chinese side notes the ROK's stance and hopes the ROK will properly handle related issues," the release said. "Both sides have agreed to continue communication through military-to-military channels."

Before the acquisition, Dressta was facing a difficult situation. Local media reported that due to fierce competitions from American and German enterprises, its business condition continued to deteriorate, even near bankruptcy.