Carter Emmart: The flat horizon that we've evolved with has been a metaphor for the infinite, unbounded resources and unlimited capacity for disposal of waste.
我们推演出来的平坦的地平线为了显出其广大而运用了一个隐喻，采取无穷无尽的方式来对材料进行处理。
2
The sewage soil disposal experiment is made mainly by using biochemical process of looser permeable soil horizon, and secondly by leaching and adsorption.