广播电视英语短句 第 175 课：引发感染-3

It says catheters should be used only if necessary. 这表明，导尿管只有在必要的时候方能使用。

Another way to prevent infections is to give patients antibiotics before surgery. 另一种避免感染的方法便是在病人手术前使用抗生素。

Doctors are advised to give them within the hour before the operation. 医生建议在术前一小时使用。

Patients who get antibiotics earlier than one hour are more likely to get an infected surgical wound. 病人若早于一小时使用抗生素，更容易引发手术伤口感染。

Also, doctors are advised to discontinue the antibiotics within twenty-four hours after the surgery. 同时，医生还建议术后 24 小时终止使用抗生素。