The electrical device used on the axle of a spool or reel to provide electrical continuity between the rotating reel core and the stationary reel chassis.

在卷轴或卷筒的轴上所用的电装置。它用来在旋转的卷筒心子与固定的卷筒架之间提供电气连接。

youdao

A spool or reel that holds thread or yarn for spinning, weaving, knitting, sewing, or making lace.

装上线和纱线以供抽丝、缝纫、编织或编制花边的。

youdao

I've seen a reel smoke from the friction of the spinning spool.

FORBES