Noticing how the rapid environmental degradation was affecting women's lives, she encouraged them to plant trees to ensure future supplies of firewood and to protect water sources and crops.
注意到环境恶化已经严重影响到女性的生活，她鼓励人们种植树木保证未来木材的供应和保护水土资源和农作物。
Nitrogen for plant nutrition is mainly obtained from three sources: nitrogen-fixing plant, rain water and manure.
氮素是植物必要的营养元素之一，其主要来源有：生物固氮作用、降雨和灌溉水以及人工施肥。
Most of the drinking water sources in our country are heavy polluted. These types of source water are hard to reach high standards after they are treated by current water plant techniques.
我国水源水污染较严重，经现有水厂水处理工艺处理后难以达到优质饮水标准。
Most of the drinking water sources in our country are heavy polluted. These types of source water are hard to reach high standards after they are treated by current water plant techniques.
我国水源水污染较严重，经现有水厂水处理工艺处理后难以达到优质饮水标准。
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