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SSS 2009-06-22

时间:2010-05-18 02:55来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American’s 60-Second Science, I’m Steve Mirsky. Got a minute?

“Stand clear of the closing doors, please.” Definitely keep your arms and legs away from the closing doors on the subway. But there’s a potentially more insidious1 danger to your health - the noise.

Mass transit2 is generally a safe way to travel, one reason why 33 million Americans use it every weekday. But a study that compared the various modes of mass transit in New York City found that the subways topped all other transit types for average noise, at a grinding 80 decibels4. The din3 was sometimes worse on the platforms, topping out at 102 decibels. Commuter6 trains were much quieter, at about 75 decibels. Remember, that’s on a log scale, so, for example, 80 is actually 10 times noisier than 70—and about three times louder than 75. Normal conversation is between 60 and 70 decibels. The study is in the American Journal of Public Health.

The EPA and the World Health Organization recommend daily averages of no more than 70 decibels to protect your hearing. So earplugs may be in order if your particular commute5 is literally7 deafening8.

 


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1 insidious fx6yh     
adj.阴险的,隐匿的,暗中为害的,(疾病)不知不觉之间加剧
参考例句:
  • That insidious man bad-mouthed me to almost everyone else.那个阴险的家伙几乎见人便说我的坏话。
  • Organized crime has an insidious influence on all who come into contact with it.所有和集团犯罪有关的人都会不知不觉地受坏影响。
2 transit MglzVT     
n.经过,运输;vt.穿越,旋转;vi.越过
参考例句:
  • His luggage was lost in transit.他的行李在运送中丢失。
  • The canal can transit a total of 50 ships daily.这条运河每天能通过50条船。
3 din nuIxs     
n.喧闹声,嘈杂声
参考例句:
  • The bustle and din gradually faded to silence as night advanced.随着夜越来越深,喧闹声逐渐沉寂。
  • They tried to make themselves heard over the din of the crowd.他们力图让自己的声音盖过人群的喧闹声。
4 decibels 05e497be99c28b77edff352bf9305209     
n.分贝( decibel的名词复数 )
参考例句:
  • The typical lawn mower makes about 90 decibels of noise. 典型的割草机发出的声响约为90分贝。 来自《简明英汉词典》
  • A normal conversation reaches 55 decibels. 普通的谈话即可达55分贝。 来自《简明英汉词典》
5 commute BXTyi     
vi.乘车上下班;vt.减(刑);折合;n.上下班交通
参考例句:
  • I spend much less time on my commute to work now.我现在工作的往返时间要节省好多。
  • Most office workers commute from the suburbs.很多公司的职员都是从郊外来上班的。
6 commuter ZXCyi     
n.(尤指市郊之间)乘公交车辆上下班者
参考例句:
  • Police cordoned off the road and diverted commuter traffic. 警察封锁了道路并分流交通。
  • She accidentally stepped on his foot on a crowded commuter train. 她在拥挤的通勤列车上不小心踩到了他的脚。
7 literally 28Wzv     
adv.照字面意义,逐字地;确实
参考例句:
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
8 deafening deafening     
adj. 振耳欲聋的, 极喧闹的 动词deafen的现在分词形式
参考例句:
  • The noise of the siren was deafening her. 汽笛声震得她耳朵都快聋了。
  • The noise of the machine was deafening. 机器的轰鸣声震耳欲聋。
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