The pyrolysis and ignition of combustible materials are important processes taking place in an unwanted fire.

在突发的火灾过程中，可燃性固体材料的着火时间和热解特性是非常关键的参数。

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Unwanted alarms , caused mainly by faulty automatic alarm systems or their poor positioning , contributed to about 56 . 9 per cent of the total number of fire calls.

警钟误鸣约占火警召唤总数的56 。 9 % ，主要是由于自动警报系统失灵或安装位置欠佳而引致。

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Unwanted alarms, caused mainly by faulty automatic alarm systems or poor positioning of such systems, contributed to about 66 per cent of the total number of fire calls.

警钟误鸣约占火警召唤总数的66 %，主要由于自动警报系统失灵或安装位置欠佳所致。

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Some cash will be used for purely private gain, for example by vulture real-estate investors in southern Florida, buying up those unused, unwanted and unsold condos at fire-sale prices.

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