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SSS 2011-05-05

时间:2011-06-04 08:42来源:互联网 提供网友:wanglihong80   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 Karen Hopkin. This will just take a minute.

Some things are best done after dark--setting off fireworks, telling scary stories and charging your plug-in hybrid1 electric vehicle, because a new study shows that topping off your car battery at night generates less ozone2. The work appears in the journal Environmental Research Letters.

Plug-in electric hybrids3 give off less exhaust than gas guzzlers. And when they’re running on battery power, they generate no fumes4 at all. But there’s a catch. The power plants that make the electricity you use to recharge the battery produce plumes5 of pollution. But how much ozone gets produced depends on when you reach for that plug.

Electric power plants that burn fossil fuels release hydrocarbons6 and nitrogen oxides. When sunlight hits those compounds, ozone forms. At night, however, well, it’s dark. And the compounds disperse7 in large part before the sun comes up.

Scientists modeled how much ozone would be generated if the cars were charged at three different times: overnight, just before they’re driven or just after. And they found that drawing electricity from the grid8 after-hours is best. So to drive green, plug in, lay down and get some ozone-free Zs.

Thanks for the minute. For Scientific American’s 60-Second Science, I’m Karen Hopkin.


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1 hybrid pcBzu     
n.(动,植)杂种,混合物
参考例句:
  • That is a hybrid perpetual rose.那是一株杂交的四季开花的蔷薇。
  • The hybrid was tall,handsome,and intelligent.那混血儿高大、英俊、又聪明。
2 ozone omQzBE     
n.臭氧,新鲜空气
参考例句:
  • The ozone layer is a protective layer around the planet Earth.臭氧层是地球的保护层。
  • The capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。
3 hybrids a5030918be299fefcf603b9326766b39     
n.杂交生成的生物体( hybrid的名词复数 );杂交植物(或动物);杂种;(不同事物的)混合物
参考例句:
  • All these brightly coloured hybrids are so lovely in the garden. 花园里所有这些色彩鲜艳的杂交花真美丽。 来自辞典例句
  • The notion that interspecific hybrids are rare is ill-founded. 有一种看法认为种间杂种是罕见的,这种看法是无根据的。 来自辞典例句
4 fumes lsYz3Q     
n.(强烈而刺激的)气味,气体
参考例句:
  • The health of our children is being endangered by exhaust fumes. 我们孩子们的健康正受到排放出的废气的损害。
  • Exhaust fumes are bad for your health. 废气对健康有害。
5 plumes 15625acbfa4517aa1374a6f1f44be446     
羽毛( plume的名词复数 ); 羽毛饰; 羽毛状物; 升上空中的羽状物
参考例句:
  • The dancer wore a headdress of pink ostrich plumes. 那位舞蹈演员戴着粉色鸵鸟毛制作的头饰。
  • The plumes on her bonnet barely moved as she nodded. 她点点头,那帽子的羽毛在一个劲儿颤动。
6 hydrocarbons e809b45a335ac8bfbaa26f5ce65d98e9     
n.碳氢化合物,烃( hydrocarbon的名词复数 )
参考例句:
  • Hydrocarbons (HC), like carbon monoxide, represent unburned and wasted fuel. 碳氢化合物(HC)像一氧化碳一样,为未燃尽的和被浪费掉的燃料。 来自英汉非文学 - 环境法 - 环境法
  • With this restricted frequency range it is not applicable to hydrocarbons. 这个较紧缩的频率范围不适用于烃类。 来自辞典例句
7 disperse ulxzL     
vi.使分散;使消失;vt.分散;驱散
参考例句:
  • The cattle were swinging their tails to disperse the flies.那些牛甩动着尾巴驱赶苍蝇。
  • The children disperse for the holidays.孩子们放假了。
8 grid 5rPzpK     
n.高压输电线路网;地图坐标方格;格栅
参考例句:
  • In this application,the carrier is used to encapsulate the grid.在这种情况下,要用载体把格栅密封起来。
  • Modern gauges consist of metal foil in the form of a grid.现代应变仪则由网格形式的金属片组成。
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