A conservative estimate of average mobile phone use now is approximately half an hour a day, seven days a week.

保守估计当今手机的使用频率是每天一个半小时，并且天天如此。

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Industry analysts estimate that sales of PNDs will grow from approximately 14 million units in 2006 to approximately 56 million units in 2011.

行业分析家估计，个人导航设备的销售量将从2006年的大约1400万部，增加到2011年的大约5600万部。

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There are approximately 28, 000 petroleum engineers in the United States, according to the most recent estimate from the Bureau of Labor Statistics, taken in May 2010.

美国劳工统计局(Bureau of Labor Statistics) 2010年5月的统计结果显示，美国目前约有28,000名石油工程师。

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The four sites--GlobeFunder, Lending Club, Zopa and Prosper--each estimate that approximately 20% of the loans they handle are for businesses.

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We estimate that approximately 17 million Americans with college degrees are employed in jobs that do not require college-level skills.

FORBES: Educated and Underemployed

In addition, the trustees of Medicare estimate that approximately 4 million people will lose their coverage under Medicare Advantage.

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