添加后，系统将给链接资源的图标上加一个小箭头(参见图3)。

After they're added, linked resources are decorated with a small arrow over their ICONS (see Figure 3).

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若元件加一斜向直线箭头、则是可变量的符号，表示其排量和压力是可调节的。

If the part adds a diagonal straight line arrow, is the variable mark, indicated that its displacement and the pressure are may adjust.

youdao

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

The typical vector is called V or A or B something with an arrow on it.

表示矢量时一般在,字母 V,A 或者 B,上面加个箭头

耶鲁公开课 - 基础物理课程节选