"以醚麻醉" can be translated as "anesthetize with ether" or "administer ether anesthesia".
Here are some example sentences for context:
1、 The surgeon decided to anesthetize the patient with ether for the operation.
(外科医生决定为病人进行以醚麻醉的手术。)
2、 In the past, ether anesthesia was commonly used, but now safer alternatives are preferred.
(过去,以醚麻醉是常用的,但现在更倾向于使用更安全的替代品。)