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　　第??(di)二??(er)個(gè)??(ge)高?(gao)發(fā)??(fa)期??(qi)在??(zai)夏??(xia)秋??(qiu)季??(ji)??，以??(yi)致??(zhi)敏??(min)性??(xing)強(qiáng)??(qiang)的??(de)草??(cao)本??(ben)植??(zhi)物?(wu)開(kāi)??(kai)花?(hua)為??(wei)主??(zhu)??，包??(bao)括??(kuo)蒿??(hao)屬?(shu)、草??(cao)屬?(shu)、豚??(tun)草?(cao)屬??(shu)、藜?(li)科??(ke)和??(he)莧?(xian)科??(ke)等??(deng)??。??　　人??(ren)吸??(xi)入??(ru)花??(hua)粉??(fen)后??(hou)??，產(chǎn)??(chan)生??(sheng)過(guò)??(guo)敏??(min)反??(fan)應(yīng)??(ying)即??(ji)為??(wei)花??(hua)粉??(fen)過(guò)??(guo)敏??(min)癥??(zheng)??，它??(ta)主??(zhu)要??(yao)是?(shi)特??(te)應(yīng)??(ying)性??(xing)體??(ti)質(zhì)??(zhi)的??(de)患??(huan)者??(zhe)被??(bei)花??(hua)粉?(fen)致??(zhi)敏??(min)后??(hou)??，引??(yin)起??(qi)的??(de)一??(yi)系??(xi)列??(lie)病??(bing)理??(li)生??(sheng)理??(li)過(guò)??(guo)程??(cheng)??。??花?(hua)粉??(fen)過(guò)??(guo)敏??(min)癥??(zheng)是??(shi)變??(bian)態(tài)?(tai)反??(fan)應(yīng)??(ying)科??(ke)常??(chang)見(jiàn)??(jian)疾?(ji)病?(bing)之??(zhi)一??(yi)??，發(fā)??(fa)病??(bing)率?(lv)呈?(cheng)逐?(zhu)年??(nian)上??(shang)升??(sheng)的??(de)趨??(qu)勢(shì)??(shi)??，嚴(yán)??(yan)重?(zhong)影??(ying)響??(xiang)人?(ren)們??(men)的??(de)健??(jian)康??(kang)和??(he)生??(sheng)活??(huo)??。。