不起皱褶的

例句：

1. 1.The surface of the car is smooth as glass.
   汽车的表面像玻璃一样光滑。
2. 2. The floor is smooth and easy to clean.
   地板光滑且易于清洁。
3. 3. The paint on the wall is smooth and even.
   墙上的油漆光滑且均匀。