semi-synthetic cephalosporins

例句：

1. 1. The antibiotic iseffective against many types of bacteria, makingit a popular choice for treating infections.
   这种抗生素对许多类型的细菌有效，因此是治疗感染的常用选择。
2. 2. In the treatmentof serious bacterial infections, semi-synthetic cephalosporinsare often used in combination with other antibiotics.
   在治疗严重的细菌感染时，半合成头孢菌素通常与其他抗生素一起使用。
3. 3.Due to their broad spectrum of activity andhigh efficacy, semi-syntheticcephalosporins are oftenprescribed for patients with severe infections.
   由于它们广泛的活性谱和高效力，半合成头孢菌素常被用于严重感染的患者处方。