placed rockfill

例句：

1. 1. The engineer carefully placed the rockfill to ensure stability.
   工程师小心翼翼地放置岩石填充物以确保稳定性。
2. 2. The construction crew used this material for the foundation of the new building.
   施工队使用这种材料作为新建筑的基础。
3. 3. The engineer had to replace the damaged rockfill with a stronger material.
   工程师不得不用更坚固的材料替换损坏的岩石填充物。