mantle edge

例句：

1. 1. The mantle edge of the forest is a natural barrier against the wind.
   森林的边缘是一道天然的风障。
2. 2.The artist carefully painted the mantle edge of his masterpiece.
   艺术家小心翼翼地绘制了他的杰作的边缘。
3. 3. The car's mantle edge was scratched by the stone.
   汽车的边缘被石头刮伤了。