贯穿整个系列，一直用 print 语句写入（输出）数据，它默认把表达式作为 string 写到屏幕上（或控制台窗口上）。

Throughout this series, you've written (output) data using the print statement, which by default writes the expression as a string to the screen (or console window).

youdao

abc里有一个print语句，可以让你在屏幕上输出，还有一个input语句，让你可以从键盘上读入，但是ABC却没有办法可以把IO重定向到文件，或者从文件重定向到IO。

There was a print statement that wrote to the screen, and an input statement that read from a keyboard, but there was no way to redirect IO to or from a file.

youdao

But the string, the sentence or the words that we're displaying on the screen, previously you clicked on a little white text field and typed it in, well now you're gonna do the same thing at the keyboard but you're gonna have to sandwich it in between double quotation marks.

这些你想输出到屏幕上的字符串啊，语句啊,单词啊，或者你事先,在白色输入框中敲进去的内容，现在你们需要用键盘做同样的事情,但是你们要写在,双引号之间。

哈佛公开课 - 计算机科学课程节选