arcing

动词 arc:

1. form an arch or curve
   同义词：arch, curve, arc

1. The sun appears to move in an arc across the sky.
   太阳看起来在天空以弧线运行。
2. An early instrument for measuring altitude of celestial bodies, consisting of a90= graduated arc with a movable radius for measuring angles.
   象限仪用来测量天体纬度的一种早期工具，由一个有90度刻度的圆弧和一个用来测量角度的可移动的半径构成