英语翻译

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Astudysuggeststhatdirtyaircanreducelungdevelopment.ResearchersattheUniversityofSouthernCaliforniainLosAngelespublishedtheirworkintheNewEnglandJournalofMedicine.

AboutonethousandsevenhundredchildrenfromdifferentcommunitiesinSouthernCaliforniatookpartinthestudy.Thescientiststestedthechildreneveryyearforeightyears,startingatageten.Theysaythisisthelongeststudyeverdoneonairpollutionandthehealthofchildren.

Thescientistsfoundthatchildrenwholivedinareaswiththedirtiestairwerefivetimesmore

likelytogrowupwithweaklungs.Manywereusinglessthaneightypercentofnormallungstrengthtobreathe.

Thedamagefromdirtyairwasasbadasthatfoundinchildrenwithparentswhosmoke.Childrenwithreducedlungpowermaysuffermoresevereeffectsfromacommoncold,forexample.

Buttheresearchersexpressgreaterconcernsaboutlong-termeffects.Theysayadultsnormallybegintoloseonepercentoftheirlungpowereachyearafteragetwenty.Thedoctorsnotethatweaklungactivityisthesecondleadingcauseofearlydeathsamongadults.Thefirstissmoking.

Bythetimepeopleareeighteen,theirlungsarefullydeveloped,orclosetoit.Thedoctorssayitisimpossibletorecoverfromanydamage.

Researcherssaytheyarestillnotsurehowairpollutionaffectslungdevelopment.Theybelievethatpollutionaffectsthetinyairspaceswhereoxygenand