爽

例句：

1. 1. The surface of the cake isvery smooth.
   蛋糕的表面非常光滑。
2. 2. The roadwas smooth as glass.
   道路像玻璃一样光滑。
3. 3. The car's paint job isincredibly smooth.
   汽车的漆面非常光滑。