Past some income level, environmental quality is almost certainly a normal good.
过去的一些收入水平，环境质量差不多可以说是正常和良好的。
Environment information system is one of the important measure to improve environmental manage level.
环境信息系统是提高环境管理水平的重要手段。
This level is also a safety limit to avoid health harm of environmental noise.
最高允许值也是为避免环境噪声对人的健康危害而定的一个安全界限。
This level is also a safety limit to avoid health harm of environmental noise.
最高允许值也是为避免环境噪声对人的健康危害而定的一个安全界限。
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