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"Compared to the old shells with known locations, the most dangerous situation is entering the scene of an anonymous threat of explosives," said Xu. "Everything is unknown. We can't make sure whether there are explosives or the type and location of the explosives."

"China's strengths in connectivity will likely be a key factor in enabling it to diversify from manufacturing technology to developing and executing new digital business models," said the report.

"China's huge market and domestic demand are like a huge driving gear to bring about the recovery and development of the world economy and bring more opportunities to other countries and the world," he said.

"Creating long-term productive assets requires wise and patient capital - a difficult challenge, and this is the reason that there is such a vast global deficiency in infrastructure investment. So Chinese capital and know-how are very important to fill this gap," he said.

"China seeks balanced trade with other countries, rather than a trade surplus," Wei said. "The expo shows China's commitment to facilitating mutual benefit and a win-win partnership with other countries and regions."