And we talked about a triad being a configuration of three pitches where you take the first, the third and the fifth.

三和弦是由三个音高配置成的，你们可选取第一，第三和第五个音。

耶鲁公开课 - 聆听音乐课程节选

Probably I shouldn't have said it's a two-step process 'cause it's a three-step process to actually write and run it, and the third step is just going to be to run it.

也许我不应该说它是个两步完成的程序,准确来讲，应该是三步，前两步--写，第三步--运行。

哈佛公开课 - 计算机科学课程节选