Bacticin

例句：

1. 1. Bacterial infections are often caused by the spread of bacteria through the air.
   细菌性感染通常是通过空气传播的细菌引起的。
2. 2. The immune system is responsible for fighting off foreign invaders, including bacteria and viruses.
   免疫系统负责抵抗外来入侵者，包括细菌和病毒。
3. 3.Bacterial infections can be treated with antibiotics, which target the bacteria directly.
   细菌感染可以通过抗生素治疗，这些抗生素直接针对细菌。