| http://www.w3.org/ns/prov#value | - Medical experts say phlegm is generated normally when one is suffering from respiratory infections, but it is also produced when the lungs are irritated by pollution and habits such as smoking and eating heavy, oily food.Li Yan, a respiratory disease expert at Beijing's Xuanwu Hospital, believes widespread respiratory infections, partly due to China's polluted environment, and the population's lac
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