concrete mattress

例句：

1. 1.The new hotel provides a comfortable and durableconcrete mattress for guests.
   这家新酒店为客人提供了舒适的耐用的混凝土床垫。
2. 2. The constructionworker used a concrete mattress to support theheavy equipment.
   建筑工人使用混凝土床垫来支撑重型设备。
3. 3. The elderly couple decided to upgradetheir old wooden bed with a new concretemattress.
   这对老年夫妇决定用新的混凝土床垫替换他们的旧木床。