在这里必须有一种方式去向对象发出一个请求，在对象收到请求后才能照指令去完成一个事务，在屏幕上打印一些东西，或是打开一个开关。

There must be a way to make a request of that object so it will do something, such as complete a transaction, draw something on screen or turn on a switch.

youdao

它允许用手写笔在用特殊磁性墨水打印的页面上做记号，同时显示在电脑屏幕上。

It would allow notations made with a stylus on a page printed with a special magnetic ink to simultaneously appear on a computer screen.

youdao

由于错误被立即捕获，用户不必重新回头在应用程序屏幕和打印表单上寻找要更正的信息。

Because the error is caught immediately, the user does not have to regain his bearings and find the information that needs to be corrected on both the application screen and the printed form.

youdao

So input is an int called F, print out to the screen or your piece of paper the value of C. Odds are you only need two, maybe three lines of code for this, but the goal ultimately will be try it on your own.

所以输入是一个int类型的F，在你的屏幕上,或你们的纸上打印出C的数值,可能你们需要两行或者三行的代码,但是最终的目标需要你自己独自尝试。

哈佛公开课 - 计算机科学课程节选

So when you have a function called GetString, -- that means it's going to get a string from the user -- -- prompt the user for a string -- whereas printf is literally going to print it, not to paper, but to the screen.

所以当你有一个叫做GetSting的函数，它的意思是从用户那获得一个字符串-,提示用户输入一个字符串-,然而printf的确是用来打印的，不是在纸上，而是在屏幕上。

哈佛公开课 - 计算机科学课程节选