planus

例句：

1. 1. The flat surface of the table is perfect for writing on.
   桌子平坦的表面非常适合写字。
2. 2. The car was parked on a flat road.
   汽车停在一条平路上。
3. 3. The new building has a flat roof and a large glass window.
   新建筑有一个平屋顶和一个大玻璃窗户。