polymorphonuclear leukocyte

例句：

1. 1. Polymorphonuclear leukocytes are responsible for fighting off infections in the body.
   多形核白细胞负责在身体中抵抗感染。
2. 2. During an infection, polymorphonuclear leukocytes are activated to fight off harmful bacteria.
   在感染期间，多形核白细胞被激活以对抗有害细菌。
3. 3. The immune system relies on polymorphonuclear leukocytes to protect against foreign invaders.
   免疫系统依赖于多形核白细胞来抵御外来入侵者。