地面上的石笋与顶上的钟乳石相接在一起时就成了“石柱”。

When these ground formations meet up with the ceiling formations, the result is a "column.

youdao

地面上的石笋与顶上的钟乳石相接在一起时就成了“石柱”。

When these ground formations meet up with the ceiling formations, the result is a "column.

youdao