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The operation is performed under anaesthetic.
手術是在麻醉狀態下進行的。
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The procedure is carried out under local anaesthetic (= a substance that makes you unable to feel pain in part of your body).
這個過程是在局部麻醉的狀態下完成的。
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I've never had a general anaesthetic (= a substance that makes you unconscious so you do not feel pain).
我從來沒有做過全身麻醉。