1. <dd id="suf2w"></dd>

      2. <em id="suf2w"><ol id="suf2w"></ol></em>

        <div id="suf2w"><tr id="suf2w"><object id="suf2w"></object></tr></div>
        <div id="suf2w"><ol id="suf2w"></ol></div>
        密码:
        注册找密码我的浏览
        设首页加收藏加书签 ______

        首页每天学英语新概念六级音标词汇语法四级研究生大学高中初中小学少儿演讲有声圣经VOA商务雅思

        您所在的位置: 大耳朵首页 > 听力资料 > 在线视听资料 >...> 大学英语四六级晨读经典365 > 秋日硕果篇 > 正文

        站内搜索:

        小提示:学单词背单词请到大耳朵免费在线背单词系统
        licensor/[]/ 许可者, 认可者...

        秋日硕果篇 Day 273 A New Type Contact Lens 新型隐形眼镜

        感谢大耳朵网友“uuu2002”提供的听力原文

        A new high-performance contact lens under development at the department for applied phys-ics at the University of Heidelberg will not only correct ordinary vision defects but will enhance normal night vision as much as five times, making people's vision sharper than that of cats.

        Bille and his team work with an optical instrument called an active mirror — a device used in astronomical telescopes to spot newly emerging stars and far distant galaxies. Connected to a wave-front sensor that tracks and measures the course of a laser beam into the eye and back, the aluminum mirror detects the deficiencies of the cornea, the transparent protective layer covering the lens of the human eye. The highly precise data from the two instruments — which, Bille hopes, will one day be found at the opticians (眼镜商) all over the world — serve as a basis for the production of completely individualized contact lenses that correct and enhance the wearer's vision.

        By day, Bille's contact lenses will focus rays of light so accurately on the retina (视网膜)that the image of a small leaf or the outline of a far distant tree will be formed with a sharpness that surpasses that of conventional vision aids by almost half a diopter ( 屈光度). At night, the lenses have an even greater potential. "Because the new lens — in contrast to the already existing ones — also works when it's dark and the pupil is wide open," says Bille, "lens wearers will be able to identify a face at a distance of 100 meters" — 80 meters farther than they would normally be able to see. In his experiments night vision was enhanced by an even greater factor: in semi-darkness, test subjects could see up to 15 times better than without the lenses.

        Bille's lenses are expected to reach the market in the year 2000, and one tentative plan is to use the Internet to transmit information on patients' visual defects from the optician to the manufac-turer, who will then produce and mail the contact lenses within a couple of days. The physicist expects the lenses to cost about a dollar a pair, about the same as conventional one-day disposable lenses.
        您是否对这篇资料想说点什么?欢迎评论或者?#26469;恚?#25110;者提交填空题答案! 您也可以立即
        共有1人向本资料提供了听力原文,其中被采用了1篇,当前有0篇待审批,有0篇未被采用! 查看明细>>
        如果您有更好的听力原文,欢迎提供给大耳朵,如果被采用,您将获得20到100金币的奖励!
        秋日硕果篇
        高瞻远瞩
        放眼全球
        推荐资源
        最新社区精华帖子更多>>
        • 走遍美国教学版
          走遍美国教学版
        • 哈利学前班[英语儿歌]
          哈利学前班[英语儿歌]
        • 海绵宝宝 英文版
          海绵宝宝 英文版
        • 风中的女王第1季
          风中的女王第1季
        经典学习方法更多>>
        听力资料目录导航
        听力测试 英语词汇 英语口语 考试英语 品牌英语 大学教材 其他教材 商务英语 广播英语 儿童英语
        历年中考听力
        初中中考模拟
        历年高考听力
        高考听力模拟
        历年四级听力
        历年六级听力
        四级听力模拟
        小学  初中
        高中  四级
        六级  考研
        托福  GRE
        星火记忆单词
        用Mp3背单词
        刘毅词汇记忆
        情景英语口语
        4+1听力口语
        出国实用会话
        英语口语8000句
        新东方900句
        美语听力与发音
        ABC到流利口语
        口译考试
        剑桥考试
        中高考考试
        大学四六级考试
        研究生考试
        公共英语考试
        英语专业考试
        新概念 六人行
        赖世雄 许国璋
        走遍美国 ?#25509;?/a>
        疯狂英语 沛沛
        语法讲座 动感
        大山英语 探索
        千万别学英语
        大学英语听力
        大学英语精读
        全新版 21世纪
        新视野 实用综
        大学体验 新编
        成人自考 step
        Listen this way
        广州版小学英语
        广州版初中英语
        剑桥少儿英语
        朗文3L看听学
        Goforit新目标
        高中英语课本
        进阶听?#21040;?#31243;
        商务英语300句
        VOA商务英语
        商业英语视频
        中级商务英语
        初级剑桥证书
        新编剑桥英语
        剑桥英语精华版
        2007年VOA慢速
        VOA中级美语
        美国习惯用语
        VOA流行美语
        澳广播英语讲座
        在线大学课堂
        VOA视?#21040;?#30446;
        宝宝ABC
        棒棒英语
        哈哈美语
        LittleFox儿歌
        英语儿童故事
        380英语小故事
        1035个英语单词
        ?
        免责声明:本站只提供资源播放平台,如果站内部分资源?#22336;?#24744;的权益,请您告知,我们会立即处理。
        Copyright © 2010-2017 大耳朵英语  京ICP备10010568号 | 京公网安备 11010802020324号

        微信扫一扫手机学英语 关闭
        微博扫一扫手机学英语 关闭
        QQ扫一扫手机学英语 关闭
        体彩排列5走势图

          1. <dd id="suf2w"></dd>

          2. <em id="suf2w"><ol id="suf2w"></ol></em>

            <div id="suf2w"><tr id="suf2w"><object id="suf2w"></object></tr></div>
            <div id="suf2w"><ol id="suf2w"></ol></div>

              1. <dd id="suf2w"></dd>

              2. <em id="suf2w"><ol id="suf2w"></ol></em>

                <div id="suf2w"><tr id="suf2w"><object id="suf2w"></object></tr></div>
                <div id="suf2w"><ol id="suf2w"></ol></div>
                0.303135s