protobrochal

例句：

1. 1. The discovery of the protozoan was a significant breakthrough in the field of microbiology.
   发现原生动物是微生物学领域的一次重大突破。
2. 2.The protogens are believed to be the first life forms on Earth.
   据信原核生物是地球上最早的生命形式。
3. 3.The protozoan is a microscopic organism that lives in water and feeds on other organisms.
   原核生物是一种生活在水里的微小生物，以其他生物为食。