mat surface

例句：

1. 1. She spreads a mat on the floor to protect it from dirt and dust.
   她在地板上铺了一块垫子来保护它免受灰尘和污垢的侵害。
2. 2. The old man sat on the mat and enjoyed the cool breeze.
   那位老人坐在垫子上，享受着凉爽的微风。
3. 3. The children were playing on the mat while their parents watched from the sidelines.
   孩子们在垫子上玩耍，而他们的父母则在一旁观看。