For the environment where exists combined hazards to work out and execute an effective and overall protective plan is very important.

对多种职业危害并存的工作环境，制订并执行有效的综合防护计划非常重要。

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Those warning drivers about speed limits and other hazards would cut fatalities by 13%. Some of these systems may be combined;

这些应用于提醒驾驶员限制车速和预防其它危险驾驶的装置将会把事故悲剧发生率降低13%。

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