第193页

信息发布者：
They collect sweat and urine and turn them into clean drinking water.
It's not wise.
Yes. We can collect the rainwater and use it to water the gardens in the community or school.
Rainwater
Gray water
Black water
Flush toilets
Become biogas
sers
olluted
ack
pecial
lone
educed
ailed
amily
etting
anguages
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