Designing a treatment wetland must be specific to the water quality target and the pollution source of the water.
处理湿地的设计必须建立在水质目标和水中污染物来源的基础之上。
A bowl of water with a few drops of oil near a heat source can make a difference in air quality.
在一碗清水里滴进几滴精油，靠近发热源就可以营造出一种完全不同的空气质量。
Some of this water may be returned to the original source with changes in the quantity and quality of the water, but some may be used consumptively.
这种水有些经过水量和水质的处理，重新回到原来的水源地，有一些则被消耗掉了。
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