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北師大版高中英語模塊11--Unit33(3)-2

所屬教程:北師大版高中英語模塊11(選修)

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https://online2.tingclass.net/lesson/shi0529/0009/9235/32.mp3
https://image.tingclass.net/statics/js/2012
[00:01.42]2 Modern lie detectors

[00:04.66]Modern lie detectors-

[00:05.98]also known as "polygraphs"-

[00:07.67]rely on the same basic principle-

[00:09.88]that lying causes bodily changes,

[00:12.57]which can be detected and measured.

[00:14.72]Having agreed to do the test

[00:16.75](if the test is done under duress,

[00:18.68]the extra stress caused

[00:20.43]makes the test unreliable),

[00:22.52]the suspect is connected to three devices

[00:24.96]measuring blood pressure,

[00:26.70]breathing rate and eletrodermal response

[00:30.27](the increased amount of electricity

[00:31.85]which flows to the skin when we sweat).

[00:34.75]Increased activity in these areas

[00:37.48]suggests increased stress...

[00:39.90]which means the subject might be lying.

[00:42.83]Lie detectors have been widely used

[00:45.04]in the US since the 1950s

[00:47.31]but they remain controversial

[00:49.16]and their results are not

[00:50.56]always accepted by courts.

[00:53.11]The results of a test taken by the British

[00:55.76]nanny Louise Woodward to support her plea

[00:58.59]of not guilty to killing a child

[01:00.94]in her care were not admitted as evidence

[01:04.12]at her trial in Massachusetts.

[01:06.62]Nowadays, polygraphs are used by the US police,

[01:10.05]the CIA and the FBI to screen job applicants,

[01:14.09]but private employers are not allowed

[01:16.26]to subject job candidates

[01:18.20]to polygraph examinations,except in a few high

[01:21.75]-security industries like pharmaceuticals

[01:24.42]and money manufacturing.

[01:24.94]

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