更新时间:2025-08-07 14:28:35
noisepollution
weknowthesoundsofcitiesareloudenoughtocausegreatharmtopeopleshearingintheu.
s.onepersonoutoftwentyhasgotsomehearingloss.andallovertheworldthesituationisgettingworseandworseallthetimesincethenoiseincreaseswiththepopulation.
withthedevelopmentofmachines,noisehasalsoincreasedgreatlyinthe20thcentury.welivesurroundedbyloudplanes,trucksandelectrictools.tvsetsandradiosaddupto90orj00decibels,acertainunitusedtomeasuretheloudnessofsound.anormaldialoguereaches55decibels;aplanegoesto100,andanordinarytrain,reachingthestation,canbetwiceasloudastheloudestplane.discomusicreachesabout118.atdecibelstheearstopshearingsound,andpainstarts.howterribleifthingsgoonlikethis!
噪音污染
众所周知,在美国,城市巨大的噪音对人们的听力造成了极大的损害。每20个人中就有一个有不同程度的听力损伤。就世界范围看来,因为噪音随着人口的不断增长,而越来越严重,这种情况也愈发恶化。
20世纪,随着机械制造业的发展,噪音污染也日益加剧。我们生活在震耳欲聋的飞机、卡车和电器中。 电视和收音机加起来甚至达到90至100分贝(分贝:一种测定声音
大小的特定单位)。人们普通的对话是55分贝;飞机飞行中为100分贝;而一列普通的火车在到站时音量能够达到最嘈杂的飞机的两倍;迪斯科音乐更是高达118分贝。到达分贝耳朵就会丧失听觉,感到痛苦。这样下去,该是一件多么可怕的事情啊!
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