arc

1. N-COUNT An arc is a smoothly curving line or movement. 弧線; 弧線運動

The helicopter made a slow arc, passing over the mound but not stopping. 這架直陞飛機做了一個緩慢的弧線運行，飛過那座小丘，但沒停下來。

2. N-COUNT In geometry, an arc is a part of the line that forms the outside of a circle. 弧[技術(shù)]