As one of effective fire extinguishing chemicals halogenated alkanes (ha) are effective, low-toxic, corrosion-free, stainless, with best chemical stability and safety for long-term storage.

卤代烷灭火剂具有高效、低毒、无腐烛、不污损保护对象、化学稳定性好、便于长期储存等优点。

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This method was very effective as the glass had not touched any surfaces between being soft and becoming hard, so it stayed perfectly unblemished, with a "fire finish".

这个方法非常有效，因为玻璃在从软变硬的过程中并没有触及任何物体的表面，因而在经过“火抛光”处理后能保持完美无瑕。

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Salvage logging may appear to be an effective way of helping forests recover after a destructive fire or storm, but it can actually result in serious loner-term environmental damage.

回收性砍伐看起来似乎是个帮助森林从破坏性大火或者暴风雨中的损害中恢复的有效方法，但是事实上却会带来长期的环境损失。

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Some fire chiefs in California say that residents should always be encouraged to evacuate, but Naomi Brown, from the Australasian Fire and Emergency Service Authorities Council, says installing effective early warning systems is the key.

VOA: standard.2009.06.24

"When they put fire retardant down on the leading edge of the fire, it's very effective in keeping the fire from advancing, " the lieutenant colonel said.

CNN: STORY HIGHLIGHTS

The government says it wants more cost effective alternatives for fire service delivery.

BBC: MP Chris Leslie warns of fire service privatisation

He said that the combination of an ageing population and fire service cuts meant that "the installation of sprinklers is perhaps the single most effective measure in protecting occupants of dwellings from fire".

BBC: Why don't homes have sprinkler systems?