A perfect first-aid system for breakdown vehicle is an important part of Intelligent Transportation system. It plays a significant role in raising the efficiency of expressway operation and service.

完善的高速公路车辆故障紧急支援系统是智能运输系统的重要组成部分，它对于提高高速公路营运效率和服务质量有着重要的意义。

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Unknown unknowns are when Murphy likes to throw another wrench in the mix that you simply can't plan for, such as (continuing with the traffic example) a vehicle accident or engine breakdown.

根据墨菲定律，“未知的未知”就是你根本没有计划到的意外事件，比如(继续以交通为例)交通事故或发动机故障。

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The belt sheave, stator winding and rectifier of the vehicle alternator have a rather higher breakdown rate. Therefore, this paper gave out their solutions to extend the alternator life.

汽车用交流发电机的皮带轮、定子线圈、整流器的故障率相对较高，本文给出了其故障的处理对策，以延长其使用寿命。

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