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"The eggs are in an accumulation without a preferential orientation, clearly showing transport" caused by strong winds and storms at that time, according to the paper by Wang's team and researchers in Brazil.

"Furthermore, with infrastructure construction connecting more countries, new trade opportunities and economic development will emerge," said Balhuizen. "I think the rest of the world is still underestimating the importance of this huge initiative," he said.

The official also warned that deep-seated problems in the world economy have yet to be fixed, calling for concerted global efforts.

BEIJING, Jan. 27 (Xinhua) -- China's popular social media Sina Weibo has been asked by the country's Internet regulator to overhaul sections that carry "harmful content".

With the country's continued opening-up and better environmental protection in the years to come, more foreign firms can benefit from China's clean energy drive.