In the light of this information it is now possible to identify a number of key issues.

根据这一信息，现在有可能发现很多关键问题。

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The key development lies in the ability of the sphere, an optical device, not only to remain invisible itself but to slow light.

关键在于光纤球功能的开发，一种光学设备，不仅要保持自身的不可见性，还要能减缓光线。

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One of the key elements in a memorable photograph may well be the quality of light.

要拍出令人过目难忘的照片，关键因素之一是光线。

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PwC then asks the key question: in the light of these figures, what has to be done now to ensure emissions fall fast enough that the target of constraining the rise in global average temperatures below 2C from pre-industrial times can be met?

BBC: Dirty secrets: What's behind carbon's rise?

The combination of those key factors made trading Revis all but inevitable, especially in light of his willingness to play hardball in previous negotiations with the Jets and their unwillingness to keep him at too high a cost.

WSJ: Jets Swap Revis for Picks

The key difference is that instead of focusing the light on a strip of photochemical film as in traditional cameras, digital cameras use an image sensor, called a charge coupled device (CCD), to capture the image.

FORBES: Technology briefing