This paper analyzed the spatial characteristics of tree-like river networks, and built vector model based on graph theory.
以树状河系为研究对象，分析其空间特征，建立基于图论的水系网矢量模型。
You aim at some astonishing peak or a swerve of the river, then examine the screen on the back of your digital camera. A rogue, blurring tree has dived across like a goalkeeper to block your shot.
你把镜头对准令人赞叹的山峰，或者蜿蜒曲折的河流，按下快门后你去看数码相机的显示屏幕——一棵淘气的树像牧羊人那样站在那里遮挡了你的镜头。
He points to the chewed bark. "They like to stand and bite the tree just to say to other bears, I'm here using this river."
他指着被啃过的树皮，“他们喜欢这样站着啃咬树皮，就是为了告诉同类，这段河流是我的领地。”
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