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China has a four-tier, color-coded warning system for severe weather, with red the most serious, followed by orange, yellow and blue.

China has adopted multiple technological approaches at the same time to fast-track the development of a vaccine for the new virus, he said, adding that the vaccine development in China is at a similar stage as international efforts.

China did not and will not use exchange rates as a measure to cope with trade disputes, and the United States labeling the country as a "currency manipulator" is inconsistent with the quantitative criteria set by the US Treasury itself, the central bank said on Tuesday.

China has a four-tier color-coded warning system for severe weather, with red being the most serious, followed by orange, yellow and blue.

China buried its first large batch of underground pipes after 1979, and many of the pipes have been aging, Liu noted.