So when a quasar goes dormant, what's left are the things we associate with a normal galaxy — stars and gas swirling around a central and hidden pit of matter.

因此当一个类星体趋于休眠，留下来的就是我们通常和一个正常的星系联系起来的东西——星星和气体，他们围绕着一个隐藏着物质的大洞形成一个漩涡。

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Greenhouse gas emissions of tar sands crude are 40% higher than conventional oil, and the open-pit mining has devastated Alberta's boreal forest.

焦油砂的温室气体排放量比普通石油高40%，露天采矿已经极大地破坏了阿尔伯塔的北方气候带森林。

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The computer simulation of fluid flow in pit furnace when large sized gears gas carburized has been done using the theory of hydrokinetics.

利用流体动力学的基本原理用计算机模拟了大尺寸齿轮在井式渗碳炉内进行气体渗碳时的流场分布。

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As a result, gas station pit stops combine to suck up 4% of the average Wyoming resident's annual gross income, compared to less than 2% for a typical New Yorker.

FORBES: Magazine Article

Drivers could communicate with their pit crews only while easing off the gas to turn a corner.

FORBES: Racecar Drivers To Use Bell Labs Microphone

But the large amount of gas released following the tremor has been both potentially dangerous and damaging to the pit.

BBC: Earthquake sparks methane alert