第117页

信息发布者：
different sizes
small ponds
keep the balance between...and...
plenty of salt water
rise to the sky
get rid of pollution
make up
call forests the "lungs" of the earth
includes all the living and non-living things in an area
has a role to play
around 71% of the earth's surface
about 70% of the earth's oxygen
wetlands store water like huge sponges
trap harmful things in their leaves and help clean the air
includes
holding
return
ct
armful
t
cover
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