树的话题任润刚人们很难说清地球上树的起源和树与人类相互依存的悠久历史。树，是生命的象征。一棵树就是一面旗帜，一座丰碑。不论是耸入蓝天与白云接吻的钻天杨，不论是枝干虬龙的老槐树，不论是充栋当梁的红松榆木，不论是垂吊英灵的青松翠柏，不论是被人不屑一顾的灌... Tree topic RenRongGang It is difficult for people to tell the origin of the tree on earth and the long history of tree-human interdependence. Tree, is a symbol of life. A tree is a banner, a monument. Whether it is sky blue sky and kissing the drill Tian Yang, whether it is the branch of the old locust tree, whether it is full of red pine elm, whether it is Yingying green pine, whether it is being dismissed Irrigation ...