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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One theory is that they were hunted to extinction by humans.

一种理论是，它们是由于人类的猎杀而灭绝的。

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The theory is the brainchild of Professor Bill Napier, from Cardiff University, who says it explains the mysterious period of extinction around 11, 000 BC.

这个理论是卡迪夫大学（Cardiff University）教授比尔·内皮尔（Bill Napier）提出的，他说这个理论解释了大约公元前1.1万年时神秘的物种灭绝时期。

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And it is hoped that there will be numerous things to find from these discoveries, including further clues as to what caused the untimely extinction of the dinosaurs 65 million years ago - the most prominent theory being that it was the result of an asteroid hitting the Earth on what is now the coast of Mexico.

BBC: NEWS | Science/Nature | Golden age of dino finds forecast