mattress|mattresses

这张床垫看起来很舒服。

This ___mattress looks comfortable.

运动员们在训练时使用厚实的垫子来防止摔伤。

Athletes use thick ___mattresses during practice to prevent injuries from falls.

新买的床垫非常舒适，让我每晚都能睡得很好。

The new ___mattress is so comfortable that I sleep well every night.