fēi​lún

fast bike

飞轮 (飛輪) fēi​lún
fast bike noun
a bicycle or vehicle that travels at high speeds
flywheel noun
a heavy revolving wheel in a machine used to store rotational energy and maintain consistent momentum
freewheel noun
the rear sprocket set or cassette of a bicycle that allows the wheel to spin independently of the pedals

Frequency

Movie subtitles
0.150 per million appears in 0% of films
Written text
1.22 per million

Sources

Definitions
CC-CEDICT