名词
中文翻译：手动交换机
同义词：
['manual relay board', 'manual switch panel例句：1. The technicians were busy troubleshooting the manual switchboard.（技术人员忙于检修手动交换机。）']
例句：
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1. The technicians were busy troubleshooting the manual switchboard.
技术人员忙于检修手动交换机。
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2. The manual switchboard was a critical part of the emergency response system.
手动交换机是紧急响应系统的关键部分。
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3. The manual switchboard had been replaced with an automated system to improve efficiency.
已经用自动化系统替换了手动交换机，以提高效率。