A default leader line is a straight line with an arrowhead that points to a feature in a drawing. Usually, a leader's function is to connect annotation with the feature. Annotation in this case means paragraph text, blocks, or feature control frames. Such leader lines are different from the simple leader lines AutoCAD creates automatically for radial, diameter, and linear dimensions whose text does not fit between extension lines.
默认的引线是指向图形中某个特征的带箭头的直线。通常，引线的功能是连接注释和特征。这里的注释指段落文字、块或特征控制框。这种引线不同于 AutoCAD 为半径标注、直径标注和线性标注自动创建的简单引线，其文字不能在尺寸界线之间自动调整。
Leader objects are associated with the annotation, so when the annotation is edited, the leader is updated accordingly. You can copy annotation used elsewhere in a drawing and append it to a leader, or you can create new annotation. You can also create a leader with no annotation appended.
引线对象与注释关联，所以在编辑注释时引线也会随着更新。用户可以复制图形中其他位置使用的注释并将其附加到引线上，也可以创建新的注释。还可以创建未附着注释的引线。
For more information about leaders, see “Overview of Creating Text and Leaders” in the AutoCAD User's Guide.
更多关于引线的详细信息，请参见《AutoCAD 用户手册》中的“创建文字和引线概述”。
