The model of grass and tree is described as a set of connected branch segments. Each segment is assumed that one side is fixed and another is free.
草木模型由互相连接的离散段组成，每个离散段一端固定，一端自由。
They branch off in various directions with some interconnecting segments.
这些分支在不同方向上某个互联部分。
They branch off in various directions with some interconnecting segments.
这些分支在不同方向上某个互联部分。
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