connecting line的用法和样例：
例句
- Line with a variable arrowhead that routes between the shapes it connects using an adjustable right-angled line.
使用可调直角线在所连形状之间绘制路线的带可变箭头的连接线。 - One major aspect to support this ability is the fact that thread arcs aim at keeping the intersection of connection lines at a minimum.
支持这项功能的一个主要方面就是，线弧着重于将连接线的交叉点保持在最小化。
