6) arrow
[英]['ærəʊ] [美]['æro]
箭头
1.
There are two traditional ways to determine the directions of the gears in common textbooks, one is the way of positive and negative sign, and the other is the way of arrow.
教材介绍的是两种传统方法,即正负号法和箭头法。
补充资料：箭头
（～儿）①箭的尖头。②箭头形符号，常用来指示方向。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条