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SSS 2008-06-18

时间:2010-05-14 02:38来源:互联网 提供网友:0922013129   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 Christopher Intagliata. Got a minute? 

Open your laptop in New York city, and chances are you'll find a Wi-Fi hotspot to surf on. Not so in tiny Lone1 Pine California, wedged between Death Valley and the Sierra Nevada Mountains. Houses are spread out, not stacked, and Wi-Fi sure ain't a long distance champ. That's why a lot of cities are abandoning their ambitious plans for universal wireless2 coverage3, explains wireless consultant4 Robert Morrow in a recent issue of Science. Morrow writes that Wi-Fi will probably stick around in offices, but he says a different wireless technology called WiMAX, developed about 4 years ago, could become the new standard for larger areas with scattered5 users. WiMAX avoids airwave interference by operating in licensed6 frequencies. And being licensed means WiMAX stations can pump up transmitting power, expanding their range to a kilometer or more, that's 20 times the range of a WiFi station. So an entire city could be covered by a score of WiMAX base stations. And if tons of users swamp a WiMAX station, it can redirect them to an uncrowded neighbor. So it looks like no matter how lost in the woods you get, you'll still be able to check your email.

Thanks for the minute for Scientific American's 60-Second Science. I am Christopher Intagliata.


点击收听单词发音收听单词发音  

1 lone Q0cxL     
adj.孤寂的,单独的;唯一的
参考例句:
  • A lone sea gull flew across the sky.一只孤独的海鸥在空中飞过。
  • She could see a lone figure on the deserted beach.她在空旷的海滩上能看到一个孤独的身影。
2 wireless Rfwww     
adj.无线的;n.无线电
参考例句:
  • There are a lot of wireless links in a radio.收音机里有许多无线电线路。
  • Wireless messages tell us that the ship was sinking.无线电报告知我们那艘船正在下沉。
3 coverage nvwz7v     
n.报导,保险范围,保险额,范围,覆盖
参考例句:
  • There's little coverage of foreign news in the newspaper.报纸上几乎没有国外新闻报道。
  • This is an insurance policy with extensive coverage.这是一项承保范围广泛的保险。
4 consultant 2v0zp3     
n.顾问;会诊医师,专科医生
参考例句:
  • He is a consultant on law affairs to the mayor.他是市长的一个法律顾问。
  • Originally,Gar had agreed to come up as a consultant.原来,加尔只答应来充当我们的顾问。
5 scattered 7jgzKF     
adj.分散的,稀疏的;散步的;疏疏落落的
参考例句:
  • Gathering up his scattered papers,he pushed them into his case.他把散乱的文件收拾起来,塞进文件夹里。
6 licensed ipMzNI     
adj.得到许可的v.许可,颁发执照(license的过去式和过去分词)
参考例句:
  • The new drug has not yet been licensed in the US. 这种新药尚未在美国获得许可。
  • Is that gun licensed? 那支枪有持枪执照吗?
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