No animals except humans have ever been known to draw unaided a picture of their environment, although some chimpanzees, given human encouragement and materials, have produced abstract paintings.

除了人类，任何动物在没有帮助的情况下都无法画出他们周围环境的图像，尽管人类的鼓励下和并给予材料，一些猩猩能画出抽象画。

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Inspection technology allows more than 100 million measurements a second to be made across the ribbon, locating flaws the unaided eye would be unable to see.

检测技术可以在一秒钟内对玻璃带进行超过1亿次的测量，从而定位肉眼无法看到的瑕疵。

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Inferential statistics is a formalized body of methods for solving another class of problems that present great difficulties for the unaided human mind.

推理统计学是一套已定形了的方法体系，它解决的是光凭人脑极难解决的另一类问题。

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Sometimes,observers see this as a comet's tail, which can be visible to the unaided eye stretching across the night sky.

VOA: special.2011.02.09

The Andromeda Galaxy is big enough and near enough to be seen by the unaided eye in the star group Andromeda on a dark night.

VOA: special.2009.01.20

However, they do not have the power to overhaul unaided a legal institution which, like much of Britain's constitutional machinery, has evolved over generations and now seems dangerously ramshackle.

ECONOMIST: The law: Judging the judges | The

Leaving the Libyans to do that unaided is admittedly a risk, but the odds are on the rebels' side.

ECONOMIST: The challenge of Libya

It is that as a mathematician he discovered - alone and unaided - the binomial theory usually attributed to a famous English scholar called Isaac Newton.

BBC: Part Three - France and the World