And, in fact there's a technique of analysis used today that's called Rutherford back scattering where people actually saw that this is a means of identifying the substance, the sample.

事实上这是现在用的一种分析技术,称作卢瑟福背散射,就是人们实际上看到的那样,这是鉴别物质样品的一种方法。

麻省理工公开课 - 固态化学导论课程节选

This is now a technique of analysis.

现在这是一个技术的分析。

麻省理工公开课 - 固态化学导论课程节选