What no one seems to be able to measure, though, even to an accuracy of several weeks, is when it really opens for business.

到底何时算作实验开始，没有人能够提供准确的时间，即便把精度范围限定在几周也不能。

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Together, the pair will measure the variation in height across the globe to an accuracy of better than two metres.

这对卫星将在全球范围内一起测量地表高度变化，其精确度低于2米。

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The satellite will be able to measure the thickness of Arctic and Antarctic ice to within a centimetre - an accuracy unmatched until now.

它能够测量南北极冰层的厚度，并精确到厘米—— 一个至今为止首次达到的精确度。

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But the real measure of the accuracy of my predictions is to look at all of the predictions, not just a small subset of them.

FORBES: Ray Kurzweil Defends His 2009 Predictions

We hoped that they would be right, that they would measure with accuracy the value of our lives against the enormity of the national interest that might call upon us to go into harm's way.

NPR: State of the Union: Democratic Response Text

Two telescopes positioned 100 metres apart, for example, can then be used to measure the position of a star with the same accuracy as a single 100-metre telescope.

ECONOMIST: A roadmap for planet-hunting