This paper presents a method of measuring the particle mean size and dust concentration by small angle near forward light scattering optics and the extinction theory.

本文综合前向小角光散理论及消光原理，提出一种测量粉尘平均粒径及粉尘浓度的光学方法。

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A multi-wave-length extinction detection method for dust is put forward. Then the principle and a principal designing scheme are given.

介绍了多波长消光法测尘的测量原理。分析了计算机辅助粉尘检测系统和工作原理。

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The impact sent up a plume of dust and debris large enough to block out the sun for years resulting in cold dark conditions that ultimately drove the dinosaurs to extinction.

这次撞击激起了覆盖 全球 的足以遮挡阳光 的灰尘与碎片，导致了寒冷黑暗 的 环境并将恐龙推向了绝灭。

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Some think that the ten-kilometre meteorite that created it threw so much dust into the atmosphere that it blotted out the sun and led to the extinction of the dinosaurs.

ECONOMIST: The ultimate environmental catastrophe