现以一实例，通过计算，介绍易燃、易爆物品、如汽、柴油、液化气储罐的环境风险评价中危害范围的确定。
How to determine the hazard scope of inflammables and explosives, gasoline, diesel oil and LPG storage tank. in EPA was introduced in this article by an example.
事故的危害范围受气象、地形等因素的影响很大，合理的项目选址，可减少事故危害，但是发生事故时工厂内的灾难是不可避免的。
Meteorology, terrain and so on influence accident's harm scope. The reasonable location of project may reduce the accident's harm, but the disaster inside of factory is inevitable.
现有的基于主机的防护技术对这些感染蠕虫的不可控节点无能为力，而隔离技术只能缩小这些节点的危害范围，无法彻底清除节点中的蠕虫。
The existing host-based prevention technology can do nothing to prevent these infected nodes, and the quarantine mechanism can only limit the propagation range and can't eliminate all of the worms.
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