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　　風(fēng)??(feng)媒??(mei)花??(hua)粉??(fen)指??(zhi)借??(jie)助??(zhu)風(fēng)??(feng)力??(li)傳?(chuan)播??(bo)授??(shou)粉??(fen)的??(de)花??(hua)粉?(fen)??，一??(yi)般??(ban)花??(hua)粉??(fen)粒??(li)小??(xiao)、質(zhì)??(zhi)輕??(qing)、量??(liang)多??(duo)??，如??(ru)柏??(bai)樹??(shu)、楊??(yang)樹??(shu)、柳??(liu)樹??(shu)、樺??(hua)樹??(shu)、梧??(wu)桐??(tong)等??(deng)；它??(ta)的??(de)特??(te)點??(dian)是??(shi)花??(hua)型??(xing)較??(jiao)小??(xiao)、色??(se)淺??(qian)、無??(wu)香??(xiang)味??(wei)??，數(shù)??(shu)量??(liang)多??(duo)??，花??(hua)粉??(fen)傳??(chuan)播??(bo)面??(mian)積??(ji)很??(hen)廣??(guang)、在??(zai)空??(kong)氣??(qi)中?(zhong)停??(ting)留??(liu)時??(shi)間??(jian)長??(chang)?。??　　北??(bei)京?(jing)市??(shi)疾??(ji)控??(kong)中??(zhong)心??(xin)建??(jian)議?(yi)花??(hua)粉?(fen)過??(guo)敏??(min)者??(zhe)外??(wai)出??(chu)時??(shi)加??(jia)強??(qiang)防??(fang)護??(hu)??。??。