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。

youdao

An upright ape living in dust with crude language and tools, all set for extinction.

那时的我们会被称作直立猿人，住在尘土里，使用粗糙的语言和工具，最后全部灭绝。

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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。

youdao

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