arc air gouging clearage

例句：

1. 1. The arc of the sun is visible from here.
   从这里可以看到太阳的圆弧。
2. 2. The car drove along an arc road.
   汽车沿着一段弧形公路行驶。
3. 3. The arc of the moon is visible in the sky.
   月亮的圆弧在天空中可见。