美国科学60秒 SSS 2013-01-25_在线英语听力室_免费在线英语听力学习网站

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　　This is Scientific American 60-second Science,I'm Sophie Bushwick.Got a minute?Scientists have used synthetic¹ DNA² to store digital files,including a photo,Shakespeare's sonnets³ and an audio recording⁴ on Martin Luther King.

　　And the pursuit of happiness...

　　The work is published in the Journal Nature.

　　Unlike many forms of information storage,DNA is extremely long-lasting and it does not require constant electric power.Plus,it's tiny-a small cup of DNA can store 100 million hours of high-quality video.

　　But until now,the storage method has faced with two many obstacles:DNA synthetic is expensive and only works for short strings⁵,and decoding⁶ process creates lots of errors.

　　To avoid these problem,British researchers broke a long string of information into many overlapping⁷ short sequences,each tagged with its position in the overall sequence.American collaborators then synthesized short pieces of DNA to match the strings and shipped the material overseas.Finally,researchers reconstructed the digital files with complete accuracy.

　　DNA storage is still very expensive.But the scientists predict advancing technology will lower prices and make their method cost-effective within a decade.

　　Thanks for the minute,for Scientific American 60-second Science.I'm Sophie Bushwick.

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1 synthetic
adj.合成的，人工的；综合的；n.人工制品
参考例句：
We felt the salesman's synthetic friendliness.我们感觉到那位销售员的虚情假意。 It's a synthetic diamond.这是人造钻石。

2 DNA
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句：
DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。 Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。

3 sonnets
n.十四行诗( sonnet的名词复数 )
参考例句：
Keats' reputation as a great poet rests largely upon the odes and the later sonnets. 作为一个伟大的诗人，济慈的声誉大部分建立在他写的长诗和后期的十四行诗上。来自《简明英汉词典》 He referred to the manuscript circulation of the sonnets. 他谈到了十四行诗手稿的流行情况。来自辞典例句

4 recording
n.录音，记录
参考例句：
How long will the recording of the song take?录下这首歌得花多少时间？ I want to play you a recording of the rehearsal.我想给你放一下彩排的录像。

5 strings
n.弦
参考例句：
He sat on the bed,idly plucking the strings of his guitar.他坐在床上，随意地拨着吉他的弦。 She swept her fingers over the strings of the harp.她用手指划过竖琴的琴弦。

6 decoding
n.译码，解码v.译（码），解（码）( decode的现在分词 )；分析及译解电子信号
参考例句：
We cannot add any other memory to this system without further decoding. 如果不增加译码，就不能使系统的存贮容量有任何扩展。来自辞典例句 Examples using the 8250 will be presented in hardware section to clarify full-decoding schemes. 在硬件一节中有应用说明全译码方案8250的例子。来自辞典例句

7 overlapping
adj./n.交迭（的）
参考例句：
There is no overlapping question between the two courses. 这两门课程之间不存在重叠的问题。 A trimetrogon strip is composed of three rows of overlapping. 三镜头摄影航线为三排重迭的象片所组成。