弧线

yī tiáo hú xiàn

一条弧线

an arc

tài yáng yǐ hú xiàn fāng shì zài tiān kōng zhōng yùn xíng

太阳以弧线方式在天空中运行。

The sun moves across the sky in an arc.

hú xiàn yùn dòng

弧线运动

movement in a curve

tiě guǐ de hú xiàn

铁轨的弧线

a sweeping curve of railroad track