because that is a skill that they need to do when they are older, filling out forms and what did one actually look like to get a passport in USA.

因为这是他们将来,必需的技能，填写表格，以及在美国,如何取得护照。

麻省理工公开课 - 媒体、教育、市场课程节选

So this is a handy way of being able to see, what are in fact the methods that are available if I don't happen to remember them, and want to go back to them.

因此这是一种简便的方式，来看看如果我不记得,可用的方法了,应如何去取得他们。

麻省理工公开课 - 计算机科学及编程导论课程节选