| Gb | Eng |
|---|---|
| 流星在空中画出了一道长长的弧线。 | The falling star described a long curve in the sky. |
| 太阳看起来在天空以弧线运行。 | The sun appears to move in an arc across the sky. |
| 碳精棒常用于电弧灯。 | The stick of carbon is often used in an electric arc lamp. |
| 曲率极限当弧长趋向于零时该曲率的极限 | The limit of this ratio as the length of the arc approaches zero. |