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In the 1960s and 1970s, after the big steelmaking movement, Beijing's original trees were almost cut down. The forestry scientists and technicians wanted to breed faster-growing aspen for greening supplements through hybrid breeding. They worked tirelessly and finally found the female aspen that our ancestors abandoned. On this basis, a new type of aspen was selected and bred.

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1.In reality, however, it is a different story, as many people are afraid to go out during the aspen‘s catkin season, especially those with allergies. This is because willow catkin can easily cause respiratory illnesses such as asthma.
2.We all know that poplar wadding is particularly flammable and can cause fires if it accidentally meets an open flame.

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Aspen twigs, leaves, flowers, and seeds. From DeByle, Norbert V., and Robert P. Winokur, editors. 1985. Aspen: Ecology and management in the western United States.

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北京的杨柳絮四处飞扬成祸害 要不要砍树成问题

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catkin