The urban vertical greening may divide into six forms: wall greening, column greening, fence greening, slope greening, pergola greening and roof greening.
城市垂直绿化的形式可分为：墙面绿化、立柱绿化、篱垣绿化、护坡绿化、棚架绿化、屋顶绿化。
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It requires a certain degree of fence, a certain density (refers to the vertical column), but also a certain intensity.