她用圆规在纸上画出了几段弧线。

She drew several ___arcs on the paper using a compass.

电影中女主角的情感发展非常感人。

The heroine's emotional ___arc in the movie was deeply moving.

火箭弧线划过夜空，留下一道明亮的轨迹。

The rocket ___arced across the night sky, leaving a bright trail behind.