| 释义 |
sprock·et
\ˈspräkə̇t, usu -ə̇d.+V\ noun
(-s)
Etymology: origin unknown
1. : a piece of wood fastened to the upper surface of a rafter to effect a change in the angle of the roof where it overhangs the wall of the building
2.
a. : a tooth or projection (as on the periphery of a wheel) shaped so as to engage with a chain
b. : sprocket wheel
c. : a toothed cylinder or wheel that engages the perforations of a motion-picture film to carry it through a mechanism (as a projector) |