line of reference

• 参考线

line of reference的用法和样例：

例句

1. You can pick the eraser tool to erase the horizontal reference line when finished.
   完成之后，你可以用橡皮擦工具擦掉水平参考线。
2. These lines are guides that help you line up the controls vertically and horizontally.
   这些线条是帮助您垂直和水平对控件的参考线。