JINGJI CANKAO(Economic Reference)In the early 1950s Beijingers choked on dust an average of 57 days of the year. But by planting trees over the years, the number of dusty days in China's capital has...
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JINGJI CANKAO(Economic Reference)In the early 1950s Beijingers choked on dust an average of 57 days of the year. But by planting trees over the years, the number of dusty days in China's capital has...