这场火是故意放的，为了清除地上的那些伐木后留下的碎屑，有利于新生树木的生长。

The fires are set deliberately to clear the land of debris after logging and to facilitate new growth.

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火的最早用途是取暖、烹调，后来才用于狩猎和作战，以及为了捕猎而清除下层丛林。

Fire was used initially for warmth, light, and cooking; later it was used in fire drives in hunting and warfare, and for clearing forests of underbrush to facilitate hunting.

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