In the case of Facebook, the company says data may hang around until the URL in question is reused, which is usually after a short period of time, though obviously that time can vary considerably.
30 What does the speaker ask us to try out?
31 What accounts for the failure of some websites to remove photos immediately?
32 When will the unwanted data eventually disappear from Facebook according to the company?
第三篇
Enjoying an iced coffee? Better skip dinner or hit the gym afterwards, with a cancer charity warning that some iced coffees contain as many calories as a hot dinner.
The World Cancer Research Fund conducted a survey of iced coffees sold by some popular chains in Britain including Starbucks, Caffe Nero and Costa Coffee to gauge the calories as studies increasingly link obesity with cancer.
The worst offender - a coffee from Starbucks -- had 561 calories. Other iced coffees contained more than 450 calories and the majority had an excess of 200.
Health experts advise that the average woman should consume about 2,000 calories a day and a man about 2,500 calories to maintain a healthy weight. Dieters aim for 1,000 to 1,500 calories a day.
The fact that there is an iced coffee on the market with over a quarter of a womans daily calories allowance is alarming, Dr Rachel Thompson, science programme manager at London-based WCRF, said in a widely-reported statement.
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