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ID:58461125
大小:1.95 MB
页数:13页
时间:2020-09-07
《英语演讲 PPT 噪声污染课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Whatisnoisepollution?Noisepollutionisdispleasinghuman-,animal-ormachine-createdsoundthatdisruptstheactivityorbalanceofhumanoranimallife.ThewordnoisecomesfromtheLatinwordnauseameaningseasickness.Withthedevelopmentofmachines,noisehasalsoincreasedgreatlyinthe20thcentury.Welivesurroundedby
2、loudplanes,trucksandelectrictools.TVsetsandradiosaddupto90or100decibels,acertainunitusedtomeasuretheloudnessofsound.Whatcausesnoisepollution?Noisepollutioncancausejustasmanydamagingeffectsonpeople'shealthasotherformsofpollution.Exposuretoexcessivenoisecancausehearingloss,stress,lackofs
3、leep,irritability,indigestion,heartburn,highbloodpressureandulcers.HumanhealtheffectsPlantsdon'thaveears,right?Atleastnotthekindwehearthingswith,whichiswhyresearchershaven'tgivenmuchthoughttotheeffectofnoiseandnoisepollutiononplants.Butallthatcouldbeabouttochange.EnvironmentaleffectsPr
4、eventionandcontrolofnoise.
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