the slow passage of a liquid through a filtering medium;
"the percolation of rainwater through the soil"
"the infiltration of seawater through the lava"
the act of making coffee in a percolator
the filtration of a liquid for extraction or purification
In fact, knowledgeable scientists of the time accepted land irrigation and percolation into the porous underground formations as methods of waste treatment. 事实上，当代有见识的科学家，已经接受了土地清洗以及过滤可渗透地底层这两种可作为处理废弃物治理的方法。