adding limestone

例句：

1. 1.The construction crew is adding limestone to the foundation of the new building.
   建筑工人正在给新大楼的地基添加石灰石。
2. 2.The engineers are adding limestone to improve the structural integrity of the bridge.
   工程师们正在向桥梁中添加石灰石，以增强其结构完整性。
3. 3. The builders are adding limestone to create a more durable surface for the patio.
   建筑师们正在添加石灰石来为露台创造一个更耐用的表面。