rubble bed

例句：

1. 1. The rubble bed was filled with broken glass and debris.
   碎石床被破碎的玻璃和碎片填满。
2. 2.He had to clear the rubble bed before he could start building.
   在开始建造之前，他必须先清理碎石床。
3. 3. The rubble bed was a hazardous area that needed to be cleared for safety reasons.
   碎石床是一个危险区域，出于安全原因需要清除。