Scientists first identified this impact in 1980 from the worldwide layer of sediment deposited from the dust cloud that enveloped the planet after the impact.

1980年，科学家首次在从尘云中沉淀下来的全球范围的沉积层中识别出这种撞击，这些尘云在撞击后围绕着地球。

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Faced with any situation that can't be solved by the sheer force of activity, they generate a dust cloud of impatience.

面对任何单凭行动的力量无法解决的情况，他们会产生不耐烦的情绪。

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Though they are strikingly visible in this image from Spitzer's infrared array camera, they are completely obscured in visible light, buried within the core of the surrounding dust cloud.

尽管它们在斯比策的远红外摄像机的图片里非常醒目，仍在云雾区域的中心地带发出的强光之下黯然失色。

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Freed believes that the lingering cloud of dust -- caused by the towers' collapse and the digging out of ground zero -- caused some of her long- and short-term medical problems, such as her "WTC cough" and other respiratory issues.

CNN: The story

The correct thing to say the Ditka thing is that you love defense, that it's an essential part of the game, that nothing tops a pair of smash-mouth clubs gritting it out in the trenches, or whatever cloud-of-dust cliches you want to use.

WSJ: Jason Gay: No Offense to Great Defense

For a moment, Haslet-Davis lay motionless amid a cloud of dust and mounting panic.

CNN: Boston bombings destroy dancer's foot, but not her spirit