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　　第??(di)一??(yi)個??(ge)高??(gao)發(fā)??(fa)期??(qi)是??(shi)春??(chun)季?(ji)??，以??(yi)喬??(qiao)木??(mu)開??(kai)花??(hua)為??(wei)主?(zhu)??，包??(bao)括??(kuo)松??(song)科??(ke)、柏??(bai)科??(ke)、楊??(yang)屬??(shu)、桑?(sang)科??(ke)等??(deng)等??(deng)；　　若??(ruo)空?(kong)氣?(qi)中??(zhong)花??(hua)粉??(fen)濃??(nong)度??(du)較??(jiao)高??(gao)??，花??(hua)粉??(fen)可?(ke)能??(neng)會??(hui)沉??(chen)積??(ji)在??(zai)下??(xia)呼??(hu)吸?(xi)道??(dao)??，導(dǎo)?(dao)致??(zhi)發(fā)??(fa)作??(zuo)性??(xing)喘??(chuan)息??(xi)、咳??(ke)嗽??(sou)、胸??(xiong)悶??(men)等??(deng)過??(guo)敏??(min)性??(xing)哮?(xiao)喘??(chuan)的??(de)癥??(zheng)狀??(zhuang)??。??。