In one recent US survey, about half the teens polled said that their cell phone had improved their communication with friends.

在美国最近的一项调查中，接受调查的青少年中约有一半表示，他们的手机改善了他们与朋友的交流。

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Let us survey some of these main areas.

我们来看看其中的一些主要领域。

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Nearly 30 percent of workers called in sick when they were not, last year, found a nationwide US survey.

一项美国全国性调查显示，在去年电话请假的员工中，有近30%的人其实在装病。 一些请假理由令人哭笑不得...

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In April 2012, a study by scientists at the US Geological Survey of the interior of the US found that events of magnitude 3 or greater had "abruptly increased in 2009" from 1.2 per year in the previous 50 years to more than 25 per year - although a number of gas and oil extraction methods may be implicated in the rise.

BBC: Oklahoma earthquake linked to oil extraction wastewater

According to the US Geological Survey, there may be deposits of rare earths in 14 US states.

BBC: US to build $120m rare earth research institute

The US Geological Survey registered the two strongest of the quakes at 5.6 magnitude.

BBC: China earthquake death toll rises in Yunnan and Guizhou