保护水资源英文.pptx

文档介绍：The water polution
The great shortage of water
Primary Pollution Sources
Dry season
Level period
wet season
Water pollution is mainly caused by the chemicals discharged by the factories. We should regulate the sewage discharge standard to minimize the impact of human activity on the environment.
Groundwater pollution
Inside the sewage through the hole drilling in nanshan, eventually flow from water-eroded cave, pollution is serious.
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The National Groundwater Quality
In 100 BC, the water can drink without purification.
In 20th century 60s, water needed purification
In 20th century 90s, water purification required more
Years later, the water will be…
It's time for us to take some measures to improve the should tre-at the wastewater before letting it go int-o can play a positive role in s-aving example we can reuse t-he water for wishing rice to wash veget-ables and then clean a mop.
Protect ourselves !!!
using
To protect water is to
drinking
Let Us
Change It !!!