methacycline

例句：

1. 1. This antibiotic is effective against many types of bacteria.
   这种抗生素对许多类型的细菌都有效。
2. 2. The patient was given a prescription for methacycline to treat his infection.
   病人被开了一张处方，用于治疗他的感染。
3. 3. Methacycline is often used as an alternative to penicillin in treating infections.
   甲砜霉素常作为青霉素的替代品，用于治疗感染。