polygonal line

• 折线

polygonal line的用法和样例：

例句

1. Fold all five sheets together on the perf line.
   将五张内页一起按折线折叠。
2. This provides a useful crease line for the finished hem at the facing width.
   这样贴边幅宽处的光底边就有了一条有用的折线。