theory of infection

例句：

1. 1. The theory ofinfection is crucial for understanding the spread ofdiseases.
   感染理论对于理解疾病传播至关重要。
2. 2.The researcher proposed a new theory ofinfection to explain the phenomenon.
   研究者提出了一种新的感染理论来解释这种现象。
3. 3. The study of thetheory of infection has led to significant advancements in medical treatment.
   对感染理论的研究已经导致了医学治疗的重大进步。