他因耳部感染正在服用抗生素。

He is on ___antibiotics for an ear infection.

尽管可能有副作用，抗生素对于对抗细菌感染至关重要。

Despite potential side effects, ___antibiotics are essential for fighting bacterial infections.

这种新抗生素对耐药菌株非常有效。

This new ___antibiotic is highly effective against resistant strains of bacteria.