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[VOA慢速] VOA慢速精精听2019-02-02

提高英语听力能力 找对方法很重要!
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In the United States, many people think a drunk driving when they hear the term breathalyzer. If you are suspected of driving under the influence of alcohol, police will most likely ask you to breathe into a breathalyzer. This device identifies how much alcohol is in your blood by measuring the amount of alcohol in your breath. Now researchers are using the same technology to test for something else, cancer. This breathalyzer, created by Aston Medical, can identify and measure chemicals in a person's breath and find this chemical at very low levels, usually parts per billion. British researchers have asked 1500 people to take part in tests of the device.
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