spleen controlling blood

例句：

1. 1. He had a spleen infection and needed to see a doctor.
   他得了脾脏感染，需要去看医生。
2. 2. The spleen is responsible for producing antibodies to fight off infections.
   脾脏负责产生抗体来抵抗感染。
3. 3. Spleen function is essential for the body's immune system.
   脾功能对于身体的免疫系统至关重要。