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"Buying a lot of snacks makes me happy, which gives me satisfaction in abundance," Zhao said.

"Chairs at offices should be designed in such a way that they can help smartphone-using workers to relax," said Gwinner.

"China is already the largest market for electrified vehicles, offering us unprecedented opportunities to develop new types of traction motors, which are the most important element of an electric vehicle's powertrain," he said.

"China has certainly benefited enormously from access to an open American economy," he said. "Those common interests haven't been changed."

"But the threat from vehicle exhaust deserves more attention because it will contribute more to the air pollution in Beijing in the future," he said, adding that emissions from coal consumption and industrial production have been cut significantly in recent years.