All objects belonging to the cell must be inside the cell boundary.
在单元内部所有的金属线都必须有单元边界。
The edges of pins and blockages must be at least one half the minimum spacing away from the cell boundary.
引脚的边缘和阻挡层必须至少有半数的最小间距离开单元的边界。
First it needed a boundary structure, i.e., a cell membrane to distinguish it from the outside world.
首先它需要一个界面结构，即一个区分它和外部世界的细胞膜。
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