变量显示为顶部的复选框。

Variables are shown as check boxes at the top.

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这个简单的函数接受任何变量，并将它显示在屏幕上。

This simple function takes in any variable and displays it to the screen.

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右上方的窗格显示变量的值。

The upper-right pane shows the values of variables.

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Well, this block here on the left that I came counter counter=0 up with arbitrarily sets a variable called counter equal to 0 and then it forever says that counters value 1 and then it changes the counter by 1.

大家看一下左边的这一段代码,其中有一个随便定义的变量,它会一直显示counter的值,每显示一次，counter加。

哈佛公开课 - 计算机科学课程节选