With most electric toothbrushes you only need to touch the tooth with the bristles.

使用大多数的电动牙刷，你只需要把刷毛碰到牙齿就行了。

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That may not seem possible now, but computers, space rockets and even electric toothbrushes seem impossible a hundred years ago.

那现在看起来似乎是不可能的，但是电脑，宇宙飞船和电子牙刷在一百年前看起来是不可能的。

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That may not seem possible now, but a hundred years ago computers, space rockets and even electric toothbrushes seemed impossible.

这可能似乎并不可能，但百年前的计算机，航天火箭，甚至电动牙刷似乎是不可能的。

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Laptops, satellite navigation, electric toothbrushes and portable music players are all top rated in a list of most-used items, both in the first month after purchase and then over the year.

BBC: NEWS | UK | Magazine | The economics of ice cream

We've seen this "advanced" technology in elementary gizmos like electric toothbrushes and shavers for decades, but it wasn't until 2009 when companies like Palm and Powermat began generating a fair amount of public interest for some of our everyday devices.

ENGADGET: Primed: how wireless and inductive charging works

Although mobile handsets are the first devices benefitting from wireless charging, the new technology can be extended to PCs, tablet PCs, electronic toothbrushes and even electric cars.

FORBES: Revolution: 3 Big Changes Coming To Smartphones