Social educational activities have a long history as human history, and it comes into being with the production of human society.
社会教育活动与人类历史一样悠久,它是随着人类社会的产生而产生的。
However, as a source and a sink as well, soil is being changed because of human activities, such as changing land use and applying fertilizers.
人类通过改变土地利用方式,大量施用化肥等活动正在改变着土壤作为温室气体源和汇的强度。
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