arc of recess

例句：

1. 1. The arc of the sunrise is breathtakingly beautiful.
   日出时的弧线令人叹为观止。
2. 2. The arc of the river reflects the beauty of nature.
   河流的弧线映照出大自然的美丽。
3. 3. The arc of the mountain range creates a stunning landscape.
   山脉的弧线创造了壮丽的风景。