以下为句子列表：
英文: Being an important part in urban mass transit, signal system plays a significant function in the safe, accurate and highly efficient traffic operation, but the incomplete design standard has caused some uncertain properties to the system designing.
中文: 摘要信号系统作爲轨道交通工程中重要的组成部分，对行车的安全、正点、高效的运行起著至关重要的作用，但由于其中的设计标准不全面，给系统设计方案造成了一定的随意性。
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英文: Taking appropriative train test line of Guangzhou metro line 2 as an example, this paper introduces the equipment, function and characters of signal system and service conditions of interfaces.
中文: 摘要以广州地铁2号线的专用试车线为例，分析其信号系统的设备概况、功能及特点，介绍各接口的使用情况。
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