The forest fires in Yunnan pine forest areas resulted from many kinds of natural factors and human activities.

云南松林区发生的森林火灾是多种自然因素和人为活动综合作用的结果。

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The forest fires in Yunnan pine forest areas resulted from many kinds of natural factors and human activities.

云南松林区发生的森林火灾是多种自然因素和人为活动综合作用的结果。

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