static perimeter

例句：

1. 1. The car isstationary in the middle of the road.
   汽车停在路中间。
2. 2. The room is staticwith no movement at all.
   房间静止不动，完全没有移动。
3. 3. The data is static;it does not change over time.
   数据是静态的；它不会随时间变化。