单词：background level
background level的用法和样例：
例句
- The background concentrations of ambient air pollutants were used as evaluation stan-dards.采用大气污染物浓度的背景值为评价标准。
- In the Campania region, baseline and background values are often coincident, where the samples represent catchment basins away from urban or industrial areas.在坎帕尼亚地区，样品代表的是远离市区或者工业区的汇水盆地，所以基线值和背景值经常是吻合的。
- noise level噪声级,噪声电平,噪音水...
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