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"But we are confident that China can well handle this debt issue as the government has started to take effective measures," she added.

"China is actively participating in global health governance and promoting the building of a shared community with a common destiny, as well as helping developing countries to achieve their universal healthcare goals," said Ma, who is leading the Chinese delegation at the assembly.

"China firmly opposes it. It is a typical unilateral and protectionist practice," said Chen Fuli, director-general of the ministry's Department of Treaty and Law.

"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.

"But we have worked hard to have a better picture of local consumers' product preferences, and scrambled to localize our products and marketing strategy," Li said.