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Beijing has 284,000 female willow and poplar trees, the main source of the flying catkins. About 37 percent of the trees are in Chaoyang district.

Beijing, for example, will levy 12 yuan on one unit of air pollution emitted and 14 yuan for water pollution, which is the highest limit of the tax range.

Before long, due to a rise in costs and less demand for handmade products, my mother turned to selling branded clothes, many of them were from Ningbo enterprises, before she eventually closed her shop.

Before joining Tencent, Yu was the principal researcher at the Microsoft Speech and Dialog Group and an adjunct professor of Zhejiang University.

Beijing is perennially troubled with water shortage. From 2014, the capital has received more than 3.22 billion cubic meters of water through the middle route of the south-to-north water diversion project.