450)=450">

当我们经常发微博发图片时，你知道其中图片链接的奥秘吗。

450)=450"> 全文听写。
450)=450"> 为了六级，为了英语的提高，大家一定要耐心听写喔~~~

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点我回顾上一期【六级听力室】2010年12月真题短文1(2/2)
It's always fun to write about research that you can actually try out for yourself. 　　Try this: Take a photo and upload it to Facebook, then after a day or so, note what the URL link to the picture is and then delete it. Come back a month later and see if the link works. Chances are: It will. 　　Facebook isn't alone here. Researchers at Cambridge University have found that nearly half of the social networking sites don't immediately delete pictures when a user requests they be removed. In general, photo-centric websites like Flickr were found to be better at quickly removing deleted photos upon request.