传统的径流小区使用混凝土建成，由边界墙、集流槽、集流桶组成。
Traditional runoff plot is comprised of boundary walls, runoff gathering pit and collecting tanks, usually building with concrete.
住宅小区主入口是住宅小区构成的重要部分，是居住区域的边界，是住宅小区进入城市区域的过渡空间。
The main entrance is the important part of residential quarter, is the border of the residential area, and also is the transition space between the residential quarters to the urban space.
可以为负的，移动小区边界左右。
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