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"Canada doesn't view trade surpluses or deficits as a primary measure of whether a trading relationship works," Freeland said in her opening remarks, adding current trade between the US and Canada is "balanced and mutually beneficial."

"Carving is probably the most difficult," she said. "You have to be extremely careful when using your strength."

"China is on a transition from a high speed in the past more than three decades to a medium ... growth rate in the future," said Liu, who was a member of the 13th National Committee of the Chinese People's Political Consultative Conference that drew to a close on Thursday. He has also helped draft the report Xi delivered at the 19th National Congress of the CPC.

"China is more a partner than an investor," he stressed.

"China has huge potential in the area since the bioethanol consumption only takes up 2 percent of the total mix in the transportation sector while the figure in the US is 10 and in Brazil it's 30," said Nielsen.