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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."

"Commitment letters may work as a way to help residents understand that such violations may lead to legal consequences and thus better regulate their daily behaviors," he said.

"Chinese companies are very innovative in e-commerce, mobile payment and sharing economy," she said.

"China's speed in pushing forward the new board has beaten market expectations," Dong said. "The first group of listed firms may start trading in late March at the earliest."

"China strongly stands against some out-of-the-region countries flexing their muscles and making provocations under the name of 'freedom of navigation and flight' that result in tensions," Wei said.