Another factor is that most players gladly pull on the national shirt, especially for a World Cup.

另外一个原因是大部分的球员都很愿意披上国家队的战袍，尤其是出征世界杯。

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If the distance between two objects is shortened twice, then the gravitational pull grows by a factor of 4.

如果两物体间距离缩小一半（减小到原来的1/2），则其间万有引力增大到4倍（增大3倍）。

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This paper will describe and compare three static rollover threshold estimation metrics:Static Stability Factor (SSF), Side Pull Ratio (SPR), and Tilt Table Ratio (TTR).

本文将阐述和比较三种静态侧翻限值的评估度量参数和测试方法：静态稳定系数（SSF）、侧拉比例系数（SPR）和侧倾试验台比例系数（TTR）。

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"We don't have the ability to force redundancy or force exit, so essentially we had to create a culture with a pull factor, " notes Martin O'Halloran, the project manager for Eircom's access network.

FORBES: The Irish way

This argument cuts little ice with Migration Watch chairman, former diplomat Sir Andrew Green, who says the presence of a settled Romanian population in the UK is a "pull factor" that will encourage more to make the journey.

BBC: Composite of images from romania

"Europe's debt crisis is the first factor to pull down exports, and the pace of decline is striking, " said Masayuki Kichikawa from Bank Of America Merrill Lynch in Tokyo.

BBC: Japan exports fall on weak demand in China and Europe