electrotherapy apparatus

例句：

1. 1.The doctor uses electrotherapy to treat patients with chronic pain.
   医生使用电疗治疗慢性疼痛患者。
2. 2.The patient was treated with electrotherapy for several weeks before the operation.
   患者在手术前几周接受了电疗治疗。
3. 3.The nurse explained the procedure of electrotherapy to the patient.
   护士向病人解释了电疗的步骤。