All the gravity of all the mass in the cosmos should have been pulling the universe back inward, just as gravity pulls a ball back down to Earth after it's been thrown into the air.

宇宙中每一物体的每个引力都会对宇宙产生一个指向物体本身的拉力，就像在重力作用下，抛向空中的球会被拉回地面。

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Normal swells, known technically as gravity waves, are created by wind pushing the surface of the sea up and gravity then pulling it down, causing it to bounce.

一般的波浪，技术上被成为重力波，是由于风推动着海洋表面上升而后又在重力的作用下被拉向下方，这便会导致海水的回弹。

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We have been pulling down world grain stocks until now they are at the lowest level in 34 years.

世界粮食储存量一直在下降，到目前为止，粮食存储量已经降到34年来的最低点。

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Irish then saw substitute Dan Murphy sin-binned for pulling down a scrum with the home side camped just five metres from their line, and Dickinson put them out of their misery when he rumbled over at the death.

BBC: Gloucester 34-20 London Irish

Thirty-five out of 50 are expected to further depreciate this year, pulling the average national values down another -3.6% by this time next year.

FORBES: Cities Where Home Values Will Rise And Fall The Most In 2011

Wukong represents a polar end of the file-sharing spectrum, pulling down dozens of DVDs, hours' worth of music and multiple applications every month.

FORBES: LimeWire, BitTorrent and BearShare...Oh My!