矿柱

例句：

1. 1. The mine is deep underground, and the pillars are visible from a distance.
   矿井位于地下深处，从远处就能看到柱子。
2. 2. The pillars were used to support the roof of the mine.
   这些柱子用来支撑矿井的屋顶。
3. 3.The pillars were made of stone and had been there for centuries.
   这些柱子由石头制成，已经存在了几个世纪了。