progymnosperm

例句：

1. 1.The progymnosperm is a rare and precious species.
   该属植物是稀有而珍贵的物种。
2. 2.Progymnosperms are found in various ecosystems around the world.
   原核生物在世界各地的各种生态系统中都有发现。
3. 3.The discovery of progymnosperms has sparked new research on their evolution.
   原核生物的发现激发了对其进化的新研究。