These are extremely dense masses believed to exist at the center of most galaxies. Their gravitational pull is so strong, they absorb light.

黑洞是被认为存在于大多数星系中心的密度极大的物质，它具有非常强的引力，可以吸收光线。

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Nearsightedness associated with cataracts in the center of the lens is often classified with the pseudomyopias, but it is actually a permanent change in the way light focuses in the eye.

与发生于晶状体中心白内障相关联的近视被归于假性近视一类，但它确实且永久地改变了光线在眼内聚焦的方式。

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The center of the Rosette Nebula, which glows with the red light of ionized hyrdorgen, is fueled by a central cluster of powerful giant stars.

一群强大的巨型恒星点燃蔷薇星云的中心，来自电离氢的红光使其绚丽夺目。

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You hear what he says, you hear the argument he makes on behalf of middle-class Americans and where we need to take this country and, as a substantive policy argument, why we cannot embrace policy proposals that, in the kindest possible light -- according to the Tax Policy Center -- would, if implemented, result in massive tax breaks -- tax cuts for millionaires and billionaires paid for by middle-class families.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

Ram's heavy duty 2500 and 3500 models come with a rear-facing camera built into the center-mounted brake light behind the cab that can beam images of a trailer or the cargo in the bed into the truck's dashboard screen.

WSJ: Pickup-Truck Drivers Still Work Hard, but in Comfort

The investment led to the creation of Steiner Studios, a 15-acre film production facility that includes five soundstages and office and support space, hundreds of thousands of square feet of new light-manufacturing space, the planned 220, 000-square-foot green manufacturing center, and the planned redevelopment of Admiral's Row into a supermarket and retail center.

WSJ: New Project Brings Anchor To Navy Yard