arcing

n.击穿,飞弧,严重打火
动词arc的现在分词

例句与用法：

The sun appears to move in an arc across the sky.

太阳看起来在天空以弧线运行。

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