名词
中文翻译：电话交换系统
同义词：
['telephone exchange', 'telephone switching system例句：1. The phone exchange is responsible for handling calls between different regions.（电话交换系统负责处理不同地区之间的通话。）']
例句：
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1. The phone exchange is responsible for handling calls between different regions.
电话交换系统负责处理不同地区之间的通话。
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2.The phone exchange provides a central location for all calls to be routed.
电话交换系统提供了一个集中的位置，用于路由所有呼叫。
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3.The phone exchange is an essential part of the communication infrastructure in many countries.
电话交换系统是许多国家通信基础设施的重要组成部分。