人们向坑里填进未分类的垃圾，然后再挖更多的坑，所以垃圾就不见了。
They filled the pits with unsorted garbage, then dug more pits and so it has gone.
目的研究城市垃圾填埋气体成分及产气规律。方法通过深圳市玉龙坑垃圾填埋场现场抽气试验及理论计算。
Study on the generation law of gases produced from municipal solid waste landfill site and their components have been conduct in Shenzhen city.
我国城市垃圾目前大多采用露天堆放和自然填坑、卫生填埋、堆肥、焚烧、源头分类收集等方法。
Municipal refuse in our country is mostly disposed by means of stacking in the open, filling of natural pits, sanitation burying, composting, burning and classifying.
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