求翻译：对于有些严重污染的地块，最好的办法就是用沥青、混凝土、粘土、薄膜等将其密封覆盖，防止渗漏，即在充分考虑垃圾填埋场的压实和沉降的基础上，在原先的填埋层上进行隔层封装。是什么意思？

For some serious pollution of land, the best way is to use asphalt, concrete, clay, film sealing cover to prevent leakage, taking full account of the landfill compaction and subsidence of the foundation, in the original landfill layer compartment package.

For some serious pollution of land, and the best solution is to use asphalt, concrete, clay, film, etc. , will be the sealed cover to prevent leakage, i.e. taking full account of the landfill and settlement on the basis of the original landfill layer on layer package.

Regarding somewhat serious pollution land parcel, the best means are with the asphalt, the concrete, the clay, the thin film and so on its seal cover, prevents the leakage, namely fills in full consideration trash buries the field the compaction and in the subsidence foundation, in original fills in

For some serious pollution of the plot, the best solution is to use the asphalt, concrete, clay, films such as sealing it covered to prevent leakage, that is, taking full account of landfill compaction and settlement on the basis of, the original interlayer on packaging in landfill layers.