planar fluence

例句：

1. 1.The floor is planar, so it's easy to clean.
   地板是平面的，所以很容易清洁。
2. 2. The car was parked on a plain surface.
   汽车停在一个平坦的表面。
3. 3. The map shows the city in a planar view.
   地图以平面视图显示城市。