Protohymenoptera

例句：

1. 1.This protozoan is a common parasite in humans.
   这种原虫是人体中常见的寄生虫。
2. 2. The study of protozoa has important implications for understanding the evolution of life.
   研究原虫对人类理解生命进化具有重要意义。
3. 3. Protozoa are found in all forms of life, from bacteria to humans.
   原虫存在于所有生命形式中，从细菌到人类。