The village encountered a new problem two decades later as the environment became heavily polluted by chemical plants and mine refineries built in 1990s.
20年后，这个村庄遇到了一个新的问题，因为20世纪90年代建成的化工厂和炼油厂严重污染了环境。
It provides basis for designing landfill gas control system and evaluation of environment, finds a new way for study of underground seepage problem such as mine gas and oil contamination.
这为填埋气控制系统的设计以及环境影响预测和评价提供了理论依据，为研究煤层气、石油污染等地下渗流问题开辟了一条新的途径。
Thirdly, parts of regions mine heavy and infuse lightly, severity exploitation, causing the environment problem.
三是部分地区重开采轻回灌，超采严重，引发环境问题；
The protection and recovery of ecological environment after exploited thecoal mine is an important problem.
矿区开发后生态环境的保护和恢复是一个重要问题。
The protection and recovery of ecological environment after exploited thecoal mine is an important problem.
矿区开发后生态环境的保护和恢复是一个重要问题。
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