名词
中文翻译：Unknown
同义词：
['procedure', 'procedure', 'action', 'act', 'conduct', 'course']
例句：
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1.The operation was successful.
手术成功了。
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2.He followed the doctor's instructions to perform the operation.
他按照医生的指示执行了手术。
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3.The operation took several hours to complete.
手术需要几个小时才能完成。