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電子課本網(wǎng) › 第117頁

第117頁

信息發(fā)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
taking
return
ct
armful
t
cover
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