Fires of natural origin have historically been extremely common throughout the temperate forests.

在温带森林中，天然发生的火灾一向是非常普遍的。

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The North of Da Xinganling Mountains is located in cool temperate zone, the research on soil animals is also extremely weak, and there are still many blank aspects.

大兴安岭北部地处寒温带，对该区土壤动物研究还极为薄弱，许多方面尚属空白。

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