planar IC transistor

例句：

1. 1. The floor is planar and smooth.
   地板是平的，光滑。
2. 2.The table is planar and sturdy.
   桌子是平的，结实。
3. 3. The roof of the house is planar and well-insulated.
   房子的屋顶是平的，保温效果好。