心形线

例句：

1. 1.The heart-shaped line on the map marks the location of the city center.
   地图上心形线条标记了市中心的位置。
2. 2.The heart-shaped line in the sky is a sign of good luck.
   天空中那条心形线条是好运的标志。
3. 3.The heart-shaped line is a symbol of love and devotion.
   心形线条是爱情和奉献的象征。