Ptilopteris

例句：

1. 1. The fossils found in Ptilopteris are significant for understanding the history of life on Earth.
   在石松中发现的化石对于理解地球上生命的历史具有重要意义。
2. 2. The discovery of Ptilopteris has sparked a renewed interest in paleontology.
   石松的发现激发了人们对古生物学的兴趣。
3. 3. The study of Ptilopteris is crucial for understanding the evolution of plants and animals.
   研究石松对于理解植物和动物的进化至关重要。