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"China is spending a lot of money trying to improve the efficiency of its pig industry," Zhao said.

"Chasing and intercepting high-speed boats requires highly specialized skills, and is also very dangerous," Worrall said. "But I've never been overtaken."

"China has talked about reform and opening-up ever since I first started going there in the early 1990s, and they have done a very good job, so now let's keep it up," he said.

"But our products are well-received: design, features, reliability, quality and safety," he said.

"China is not the enemy," Jeffrey Sachs, a professor at Columbia University, wrote in an opinion column published by CNN. "It is a nation trying to raise its living standards through education, international trade, infrastructure investment and improved technologies.