英语翻译
Therearesomeplacesintheworldwheregreatcitiesoncestood.Thereweregardens,treesandgrass.Butnowthesecitieshavegoneandtheplacesarelikedeserts.Scientistsbegantostudythislandtofindoutwhathadhappened.Manyofthembelievedthelanddiedwhenthetreeswerecutdown.
Treeshelpotherplantsgrowandhelpholdthesoilinplace.Theykeepthesoilfromblowingaway.Theleavesoftreesonthegroundkeeprainwaterfromrunningoff.Treesnearfarmsprotectgrowingplantsfromstrongwinds.
OncetherewerehundredsoffarmsintheSouthwesternUnitedStates.Thenthefarmsturnedintofieldsofdrydust(尘土).Treesmighthavesavedthesefarms.ButfewtreesgrowinthedrySouthwestnow.
Nowwetrytosavetrees.Inmanyplaces,whenatreeiscutdown,anewtreeisplantedinitsplace.Wedonotwantthelandtodie.
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