3 sentences

1. 这张床垫非常舒服。

   zhè zhāng chuáng​diàn fēi​cháng shū​fu.

   This mattress is very comfortable.

   Source: Dong Chinese Dictionary

2. 我们要床垫干嘛？

   wǒ​men yào chuáng​diàn gàn​má?

   What do we need a mattress for?

   Source: OpenSubtitles

3. 床垫里的弹簧已经失去弹性了。

   chuáng​diàn lǐ de tán​huáng yǐ​jīng shī​qù tán​xìng le.

   The springs in the mattress have lost their elasticity.

   Source: Dong Chinese Dictionary