公交车短裙挺进太深了h女友,国产亚洲精品久久777777,亚洲成色www久久网站夜月,日韩人妻无码精品一区二区三区

233??У- ????????????

????
您現在的位置:233網校 >> 英語四級考試 >> 聽力 >> 聽力模擬試題 >> 文章內容

2014年英語四級聽力練習:慢速VOA(5.5)

  From VOA Learning English, this is the Technology Report.

  United State officials are close to approving new requirements for enabling vehicles to communicate with each other. Officials hope the new technology will reduce the number of traffic accidents. Automobile manufactures may be required to equip all new cars with what are being called ’vehicle-to-vehicle’ communication devices within the next 3 years.

  Vehicle-to-vehicle, or V2V, is a communication technology. It enables vehicles to share information about their speed and movement at a rate of 10 times a second. Cars will be able to identify possible dangers within about 300 meters. The cars will then warn their drivers or even take action to avoid in accident.

  The drivers will be able to see, hear and even feel the warning signals through shaking of the seat. The U.S. National Highway Traffic Safety Administration expects the new system to reduce the number of car accidents by as much as 80 percent.

  Greg Winfree is with the U.S. Department of Transportation. He says the new technology will change the way people deal with traffic accidents.

  "The way to look at it is the first 50 years of transportation safety were focused on surviving crashes. We see the future as technology that avoids crashes overall," said Winfree.

  Critics admit that V2V technology is a major development, but they are concerned about possible conflicts with other wireless devices. They say those devices already operate in the wireless frequencies planned for V2V technology.

  Scott Belcher is the chief operating officer of the group Intelligent Transportation Society of America.

  "If somehow we are sharing this spectrum and there’s interference and so a car that could have, we could have prevented the crash, we are not able to prevent the crash because someone else is using the spectrum," said Belcher.

  Scott Belcher says people may also be concerned about their privacy. He worries about the possibility of using V2V technology to follow individual drivers and document their driving habits. Government agencies and private industry have already invested almost $1 billion in research.

  U.S. officials expect the new technology will be required in American vehicles by early 2017. They believe it is the first step toward a better and safer transportation system.

  And that’s the VOA Learning English Technology Report. For more stories about technology and other subjects, go to our website 51voa.com. Give us a like on the VOA Learning English Facebook page. Follow us on Twitter at VOA Learning English. You can also watch videos on the VOA Learning English YouTube Channel. I’m Jonathan Evans.

  233網校英語四級考試網提供:2014年大學英語四級各個題型的精講分析課程,免費試聽!老師為您答疑解惑手機客戶端也可觀看,讓您隨時隨地學習!了解詳情>>

  聽力練習:英語四六級改革題型聽力:VOA美國之音聽寫練習匯總

  詞匯匯總:10天攻克大學英語四級核心詞匯匯總

責編:YYT  評論  糾錯

課程免費試聽
?γ??????? ??? ???/???? ??????? ????
????????????????????????????????? ????? ??100 / ??100 ????
???????????????????????? ????? ??100 / ??100 ????
???????????????????????? ????? ??100 / ??100 ????
??????????????????д???? ????? ??100 / ??100 ????
主站蜘蛛池模板: 棋牌| 扎兰屯市| 安达市| 景东| 凯里市| 张家口市| 英山县| 福贡县| 渑池县| 凤庆县| 延边| 泗洪县| 韩城市| 青铜峡市| 商洛市| 西畴县| 澜沧| 武宣县| 文山县| 苍梧县| 灵川县| 万年县| 兖州市| 金秀| 固原市| 西城区| 广西| 那坡县| 莆田市| 东乌珠穆沁旗| 专栏| 甘泉县| 新闻| 永寿县| 临高县| 武义县| 古蔺县| 潜山县| 汽车| 开江县| 五河县|