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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Gravity exerts a natural pull straight downwards, towards the center of the earth.

地心引力施加一个垂直向下，指向地球中心的自然拉力。

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I am in my center, a place of no push and no pull.

我在我的中心里，一个没有将我推进或是拉出来的地方。

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John Hagel and John Seely Brown, co-chairs of Center for the Edge, suggest that one of the best ways to pull the C-suite into exploring the use of social software is to point out how it can find and fix expensive operating problems.

FORBES: Finally an Enterprise Roadmap for Capturing the Full Power of Social

The controversy could pull him into the center of the political fray even before he formally takes the reins.

CNN: Democrats prepared to push ahead with aid to automakers