課堂翻譯

page.55 第五段

原文: Throughout the hydrologic cycle, many natural processes
purify water. Evaproation and subsequent precipitation act as a
natural distillation process that removes impurities dissolved in
water. Water flowing above ground through streams and lakes
and below ground in aquifers is naturally filtered and partially
purified by chemical and biological processes, mostly by the
actions of decomposer bacteria, as long as these natural processes
are not overloaded. Thus, the hydrologic cycle can be viewed as a
cycle of natural renewal of water quality.

翻譯:所有水文循環方面，許多天然的作用會淨化水質。蒸散作用
以及連帶發生的降雨作用分離移除水中的雜質，可被視為一種天
然的淨化水質處理。水在地表上流過溪流、湖泊，在地表下透過
地下蓄水層過濾部份經由化學上的以及生物上的過程，大多是藉
由分解者細菌，不過前題是不能超出作用的負載量。因此，水文
循環可以被看成是一種天然的復原更新水品質的循環。