polymorphonuclear leucocyte

例句：

1. 1. The doctor diagnosed the patientwith a serious infection.
   医生诊断病人患有严重的感染。
2. 2. Polymorphonuclear leukocytes are essential for fighting infections.
   多形核白细胞对于抵抗感染至关重要。
3. 3. Duringan infection, polymorphonuclearleukocytes play a crucial role inthe immune response.
   在感染期间，多形核白细胞在免疫反应中扮演着关键角色。