To date, there have been no long-term studies on the effects of cell phone usage among children.

到目前为止，没有做过儿童中长期使用手机的研究。

youdao

Results from individual participating countries have suggested an association between more than 10 years of mobile phone usage and some tumours.

个别参与国的调查已经表明了连续10年以上的手机使用和肿瘤的某种联系。

youdao

Internet usage, mobile phone usage, advertising dollar spend - all have grown enormously over the last 15 years to provide a stronger foundation underneath the latest boom.

互联网应用、手机应用、广告支出——所有这些在过去15年中都有了巨大的增长，为最新一轮繁荣提供了更强有力的支持。

youdao

But,on the other hand, Ms.Teltscher says mobile phone usage has reached sixty-eight percent in developing countries.

VOA: special.2010.10.25

Founded in 2009, the service aggregates anonymized data, such as mobile phone usage and other data.

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One possibility is that years of cell phone usage has conditioned us to anticipate the arrival of new messages.

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Cell-phone usage and Internet access has also taken off in South Korea over the last five years.

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