Phthanite
燧石, 角石, 英石岩
🗣️ 情景例句
How did the accident happen?
事故是怎么发生的？
Sorry to keep you waiting.
抱歉让你久等了。
After switching on powerful arc lights, they saw great stalagmites -- some of them over forty feet high -- rising up like tree-trunks to meet the stalactites suspended from the roof.
他们打开强力弧光灯，看见一株株巨大的石笋，有的高达40英尺，像树干似地向上长着，与洞顶悬挂下来的钟乳石相接。