secondary immune response

例句：

1. 1. The body's immune system isresponsible for responding to infections.
   身体的免疫系统负责对感染做出反应。
2. 2. During an infection, thesecondary immune response can help clear the pathogen.
   在感染期间，次级免疫反应可以帮助清除病原体。
3. 3. The immune response is a complexprocess that involves multiple cells and molecules.
   免疫反应是一个复杂的过程，涉及多种细胞和分子。