Structures can be analyzed in terms of how they deal with downward forces created by gravity.

人们根据建筑物如何处理由重力产生的向下的力来分析它们。

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Over billions of years, the gas was compressed by gravity into galaxies, stars, plants and eventually, even humans.

在数十亿年的时间里，这些气体被引力压缩成星系、恒星、植物，最终甚至变成了人类。

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The stone rolled down the mountain by gravity.

这块石头由于重力作用而滚下山。

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Mr. RICHARD BINZEL (Astronomer): The word planet is strictly defined to be a body rounded by self-gravity, which has cleared its orbital zone.

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Shares of Apple, along with shares from many other profitable and stable companies, seem to have been trapped by that stock-market gravity.

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These politicians tend to rely heavily on the support of unionized public-sector workers and almost always repay the favor by lavishing those same workers with a gravity-defying upward spiral of ever-increasing pay and benefits.

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