You can kind of see where the syntax is going, looks like a loop, but you can kind of put blocks inside of you, and the little arrow suggests that once you get to the bottom just like our socks example, you're gonna do the following again.

从某种程度上你可以看到它的语法构成,像个循环，你也可以把，一些程序块放到循环中，如同短袜的例子，这个小箭头暗示你一旦到达底部,你将会重复接下来的事情。

哈佛公开课 - 计算机科学课程节选

Scratch This Boolean expression allows you to say to scratch if you are touching the mouse pointer, the little arrow, do something. How do we do something?

布尔表达式允许你告诉,当你触碰到鼠标指针，也就是小箭头，程序就相应地做一些事情？

哈佛公开课 - 计算机科学课程节选

Now, you realize that... By the way, when you draw a vector like A, you're supposed to put a little arrow on top.

现在,大家应该发现...,顺便提一下,当你画了一个矢量,比如 A 时,上面要加个小箭头

耶鲁公开课 - 基础物理课程节选

If you don't put an arrow on top, it means you're talking about just a number A.

如果不加这个小箭头,也就意味着你只是在讨论一个数字 A

耶鲁公开课 - 基础物理课程节选