"Data exhaust" -the trail of clicks that Internet users leave behind from which value can be extracted-is becoming a mainstay of the Internet economy.

“数据废气”—网络用户点击后所留下来能被萃取数值的踪迹—正成为网络经济的主要支柱。

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The car left a trail of exhaust fumes.

车子留下废气的痕迹。

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The sports car ripped away in a trail of exhaust.

那辆赛车一溜烟地向前飞驰。

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GlobalSecurity.org, a Washington-based firm that focuses on "emerging security challenges, " said the image released by DigitalGlobe shows the contrail, or vapor trail, and rocket exhaust plume of the launch vehicle.

CNN: Photo reportedly shows N. Korean rocket in flight