Tree structure view: in this format, the WBS is depicted using a tree structure with each child element connected to the parent element through a line.
树状视图：在这种格式中，用树状结构来体现WBS，每一个子元素都由连接线连到父元素上。
The tree-shaped structure of nodular vascular framework is connected with the vascular system of plant in the base, It was derived originally from the plant lateral root primordium.
它在基部与植物维管系统联成一体，在本质上是由植物侧根原基衍生而来。
The tree-shaped structure of nodular vascular framework is connected with the vascular system of plant in the base, It was derived originally from the plant lateral root primordium.
它在基部与植物维管系统联成一体，在本质上是由植物侧根原基衍生而来。
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