PTE听力口语练习-科学60秒: New Function in Smartphone

PTE考生目前最大的问题之一就是练习题缺乏。除了有限的基本官方书(PLUS,Testbuilder, OG)之外

就没有题了。很多英语基础不是很扎实的同学很难找到练习材料。悉尼文波雅思PTE培训学校专门为澳洲,尤其是悉尼、墨尔本的PTE考生准备了适合PTE听力阅读练习的科学60秒。各位PTE同学可以练习PTE听力中的summarise spoken text和PTE口语中的retell lecture,PTE听力口语-科学60秒-Frosty Moss练习记笔记技巧和复述。废话少说,下面开始:


60秒科学节目(SSS)是科学美国人网站的一套广播栏目,英文名称:Scientific American – 60 Second Science,节目内容以科学报道为主,节目仅一分钟的时间,主要对当今的科学技术新发展作以简明、通俗的介绍,对于科学的发展如何影响人们的生活环境、健康状况及科学技术,提供了大量简明易懂的阐释。

Devices that detect potentially hazardous gases or airborne environmental pollutants are out there.

But they’re expensive and bulky.
Now M.I.T. researchers say they’ve developed a way to get the same detection abilities—with your smartphone.
The research team modified what are called near-field communication tags, or NFC tags.

Smartphones with NFC capabilities send out magnetic field pulses.

The magnetic field creates an electric current on the tag that the phones pick up.
Such systems are typically used to track products or drugs.
For the new application, the scientists added links to the circuit made of carbon nanotubes.
Each link responds to one particular gas, by changing how the nanotubes conducts electricity.
By sensing the change in electric current on the tag,the smartphone signals that it has detected the gas in question.
The method was tested with ammonia, cyclohexanone and hydrogen peroxide.
And the tags could sense the substances at levels of a few parts per million.
The research is in the Proceedings of the National Academy of Sciences.
Such inexpensive tiny tags require no external power.
The scientists say their NFC tag system has the potential to be widely used to monitor gases that can affect health, safety and the environment.



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