environment evolution trend
environment evolution trend
环境演变趋势
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Based on the monitoring data during 1991-1997, the groundwater environmental quality in Shijiazhuang was analyzed and assessed, and the evolution trend of the groundwater environment was studied.
对石家庄市1991 ~ 1997年间的浅层地下水环境质量进行了分析评价，查明了地下水环境的演化趋势。
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