When a child masters turning on and off a light switch, his brain has expended more energy than the most complicated computer that we have on earth.

一个孩子学会开灯关灯的时候，他的大脑消耗的能量超过地球上最复杂的电脑。

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There are lots of minor changes, nothing earth-shaking that should warrant a switch for anyone.

这里有很多次要的更新，没有一个保证改变得足够震撼用户。

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When the switch is turned to any of its variable speed "on" Settings, current can flow though the switch and down to earth to allow the relay to switch on.

当开关转变为任何变速“开启”的设置时，电流可以通过开关接到地上，继电器开启。

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Environmental groups like Greenpeace and Friends of the Earth would like to see a switch to renewable and clean sources of energy such as solar, wind and hydro-electric power.

BBC: Impact of global warming may be severe and wide-ranging

And there's been plenty of time for his curiosity to evolve: WALL-E has been alone on Earth for seven centuries, ever since the last humans left and neglected to switch him off.

WSJ: 'WALL-E' Is Richly Human Tale of a Robot

In the lower left is a button that brings up your current location, and in the lower right is a tiny icon that lets you switch to satellite view, to see public transit and traffic information, or to launch the separate Google Earth app.

WSJ: Google Maps for iPhone Returns With Redesign That Makes It Easier to Use