Summersonn.萨默森summern.夏天；夏季adj.夏季的v.度过夏天Summer precipitation in Liaoning province辽宁夏季降水Summer why particularly easy dizziness?summer maize-winter wheat rotation system夏玉米-冬小麦轮作制Summer chrysanthemum with small inflorescence小花型夏菊summer green broad-leaved forest vegetation夏绿阔叶林植被Summer. Early summer....shocker?summer-maize and winter-wheat rotation ecosystem夏玉米-冬小麦轮作生态系统