A reasonable snow emergency vehicle scheduling could not be achieved based on personal experience because of the complexity of urban road network.
城市道路网络复杂，合理的除雪车辆调度方案仅仅依靠人工经验无法实现。
This paper established an integer programming model of the snow emergency vehicle scheduling which considered the realistic constraints such as the fleet size and the level of service.
本文考虑冬季道路养护中的服务水平、车队规模等约束条件，建立了实习信息下除雪车辆优化调度的整数规划模型。
The storm had dumped over two feet of snow in a few short hours and a state of emergency was declared. The roads were impassable, phone lines were jammed and we all felt helpless.
这是一次突发事件，这场暴风雨在几小时内就下了2尺，道路无法通行，电话也不能接通，我们感觉到很无助。
Emergency crews there and in states all along the eastern seaboard were racing to correct the same problems: collapsed power lines, brought down by icing and wet, heavy snow.
当地以及沿东海岸的各个州的紧急事务工作人员都在回应同样的问题——电线瘫塌。
Snow shovel can be used for avalanche rescue, emergency shelter and tent site.
雪铲可以用在雪崩营救、紧急避难和搭建帐篷中。
Reports say the site of the crash has been difficult for emergency workers to reach because of heavy snow.
报道称，由于大雪的缘故，紧急救援人员难以到达坠机现场。
Unexpected winter weather has hit Western states as emergency crews geared up for a more-snow-and-flooding Wednesday.
意外的冬季天气袭击西部各州，急救人员召集起来应对周三更多积雪和洪水的状况。
Unexpected winter weather has hit Western states as emergency crews geared up for a more-snow-and-flooding Wednesday.
意外的冬季天气袭击西部各州，急救人员召集起来应对周三更多积雪和洪水的状况。
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