以下为句子列表：
英文: Since the strain of erecting double contact wire of overhead contact system in urban rail transition is quite great, the author integrates the experience of construction of Shanghai Pearl Line 1 in the first phase and holds that the application of equival
中文: 摘要基于城市轨道交通接触网系统中双承力索、双接触线张力比较大这一特殊情况，结合上海轨道交通3号线一期工程的具体实践，介绍了张力等效负载法的应用方法及原理。
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英文: The Breaker is composed of 4 parts, I e., the insulating case, operating mechanism, contact system and tripping device, featuring quick make and break and free trip.
中文: 断路器由绝缘外壳、操作机构、触头系统和脱扣器等四部份组成，具有快速闭合、断开和自由脱扣机构。
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