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"China and the United States are the world's leading innovators, which have (a) strong mutual and beneficial relationship," he said.

"Can't understand the rules. I quit."

"China has multiple landforms including plateaus, mountainous regions and plains, so the helicopter must be able to operate in every landform. Foreign helicopters have not met our needs, especially those in plateaus and mountains," he said.

"China has a culture and system that has worked well for it for a long time, so it shouldn't be expected to change much; the US has the same; these systems (and those of other countries) will be both competing and cooperating, and how well they do that will be an important influence on global conditions."

"China always looks ahead to the next stage, and that, I think, is even more important now than it ever was," said Nicholas Stern, chair of the Grantham Research Institute on Climate Change and the Environment at the London School of Economics and Political Science.