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China has many geographical features including mountains, deserts and islands, so heavy-lift helicopters can play important roles in civilian sectors, according to Vasily Kashin, a senior analyst at the Moscow-based Center for Analysis of Strategies and Technologies.
China has a six-level air pollution system depending on the air quality index (AQI). Excellent air requires index levels below 50, and if the index falls between 151 and 200, the day is classified as moderately polluted. Days when the index rises over 300 are considered severely polluted.
China began importing solid waste as a source of raw materials in the 1980s, and has for years been the world's largest importer of recyclable materials.
China has been educating its next generation to prepare for unexpected events or potential risks. And it seems there is no curriculum more cogent than the reality that reflects the old saying, "Bring an umbrella on a sunny day; save food when you are full."
China has a four-tier color-coded weather warning system, with red representing the most severe, followed by orange, yellow and blue.
来源：资阳报