mortar bed

例句：

1. 1. The construction workers used a mortar bed to level the ground.
   建筑工人使用砂浆床来平整地面。
2. 2.The engineer designed a mortar bed that would support the weight of the building.
   工程师设计了一个砂浆床，以承受建筑物的重量。
3. 3. The mortar bed was carefully poured to ensure the wall was stable and strong.
   砂浆床被小心地倒入，以确保墙壁是稳固和坚固的。