To get at these non-mutating parts of the virus, Nabel and his colleagues used a two-step vaccination process, called "prime-boost."

VOA: standard.2010.07.21

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

So writing a program at least in this language is a two-step process.

用这种语言写一个至少需要,两步完成的小程序。

哈佛公开课 - 计算机科学课程节选

But what happens is you can do a two-step process.

但你可以采取两步法。

耶鲁公开课 - 心理学导论课程节选

So it turns out that there's a two-step process.

好像有两步要走。

哈佛公开课 - 计算机科学课程节选