The evergreen forests of the Amazon and Congo basins, for example, are generally fire-free because the closed canopy maintains a level of humidity that inhibits burning.

例如，亚马逊和刚果盆地的乔木通常是防火的，因为它们遮天的树冠保持了一定的湿度，抑制了燃烧。

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This paper studies economy analysis index system of burning blended coal of fire resistant coal from Viet Nam and free-burning coal from Tashan of China or Indonesia on 600 MW super critical unit.

研究了600 MW超临界机组掺烧越南无烟煤等极难燃煤种和塔山煤、印尼煤等极易燃煤种的经济性分析指标体系，给出了一套较为简单的、适合现场评估的经济分析指标。

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