超过十分之一的人以燃烧木材或动物粪便以获得更多照明。
More than one in ten just pile extra wood or dung on the fire if they need more light.
有机物质，如植物或动物粪便，通过生物过程或制剂的作用向有用物质或能源的转化，如某些微生物。
The conversion of organic materials, such as plant or animal waste, into usable products or energy sources by biological processes or agents, such as certain microorganisms.
事实上他们大部分的收入，都花在这种照明方式上。26亿人以露天炉灶煮饭，烧煤、木头或动物粪便。
And in fact they spend a lot of their tiny income on that form of lighting. 2.6 billion people cook on open fires — on coal, wood and animal dung.
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