hard-to-cut rock

例句：

1. 1. The hard-to-cut rock was a challenge for theconstruction crew.
   这种难以切割的岩石对施工队伍来说是一大挑战。
2. 2. The hard-to-cut rockmade it difficult to excavate the tunnel.
   这种难以切割的岩石使得挖掘隧道变得困难。
3. 3. The hard-to-cut rock was a significant obstaclein the construction project.
   这种难以切割的岩石是该项目的一个重大障碍。