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

As we saw before, it simply concatenates them together and gives me back a longer string.

和我们之前学过的一样,这个操作会把两个字符串连接起来。

麻省理工公开课 - 计算机科学及编程导论课程节选