森林火灾是指失去控制的森林燃烧。
自然界有多种燃烧现象，其中森林燃烧是最复杂的一种。
There are many kinds of burning in nature, but forest burning is the most complicated one.
其中在可燃物作为森林燃烧的重要条件，对森林火险影响突出。
In which the fuel combustion as a major forest conditions, forest fire effects prominent.
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