Bier's local anesthesia

例句：

1. 1.The doctor used a local anesthetic to numb the area before surgery.
   医生在手术前使用局部麻醉剂来麻木该区域。
2. 2. The patient was given a local anesthetic to relieve pain during the procedure.
   患者在接受治疗过程中被给予局部麻醉剂以减轻疼痛。
3. 3. The surgeon used a local anesthetic to prevent infection at the surgical site.
   外科医生使用局部麻醉剂以防止手术部位感染。