因为它们能消灭那么多的昆虫，其中包括一些人类的大敌。
Because they destroy so many insects, and insects include some of the greatest enemies of the human race.
甲烷的主要自然源包括反刍动物和一些昆虫的肠发酵及淹水土壤的有机物的厌氧分解。
The Major natural sources of atmospheric methane include enteric fermentation in ruminants and some insects, and the anaerobic decomposition of organic matter in waterlogged soils.
因为它们消灭了那么多昆虫，包括一些属于人类最大敌人的昆虫。
Because they destroy so many insects, and insects include some of the greatest enemies of the human race.
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