environmental quality objective
Environmental Publicity Campaign 环境宣传运动；环保宣传运动 environmental quality objective 环境质素指标 environmental quality performance limit 环境质素表现规限 ..
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地衣对环境污染极端敏感，可作为测试空气质素的指标。
Lichens are extremely sensitive to atmospheric pollution and can be used as indicators of air quality.
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