名词
中文翻译：电话交换机
同义词：
['telegraph exchange', 'telephone exchange']
例句：
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1. The telephone-telegraph switch is the main control center forthe entire network.
电话-电报交换机是整个网络的主要控制中心。
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2. Theengineers were busy troubleshooting the telephone-telegraph switch.
工程师们忙于修理电话-电报交换机。
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3. The telephone-telegraph switch was a critical component inthe early days of telecommunications.
电话-电报交换机在电信初期是一个关键组件。