polycycline

例句：

1. 1. This antibiotic is effective against many types of bacterial infections.
   这种抗生素对许多类型的细菌感染有效。
2. 2.Polycycline is a common medication used to treat urinary tract infections.
   多西环素是一种常用的药物，用于治疗尿路感染。
3. 3. The patient was given a prescription for polycycline to prevent further infection.
   患者被开了一张多西环素的处方，以防止进一步感染。