sprocket
US /ˈsprɑː.kɪt ˌwiːl/
UK /ˈsprɑː.kɪt ˌwiːl/

1.
鏈輪, 齒輪
a toothed wheel that engages with a chain, track, or other perforated material
:
•
The bicycle chain runs over the sprocket.
自行車鏈條在鏈輪上運行。
•
The tank's track is driven by a large sprocket.
坦克的履帶由一個大鏈輪驅動。