heel line

例句：

1. 1.He put his foot on the heel line and started walking.
   他踩在脚跟上开始走路。
2. 2. The heel line was a crucial part of the design.
   脚跟线是设计中至关重要的一部分。
3. 3. She wore high heels that made her feet look longer than they really were.
   她穿着高跟鞋，让双脚看起来比实际更长。