Graptolithina

例句：

1. 1.The ancient city of Pompeii is famous for its many artifacts, including the famous Roman amphitheater.
   庞贝古城以其丰富的文物而闻名，其中包括著名的罗马竞技场。
2. 2.The stalactites and stalagmites are a wonder to behold in this underground cavern.
   这些石笋和石柱在地下洞穴中令人叹为观止。
3. 3. The stalactites and stalagmites are formed by dripping water from the ceiling into the ground.
   石笋和石柱是由从天花板滴下的水形成的。