sprag

英 [spræg]美 [spræg]

n. 止轮垫（防止车子在斜坡往下滑）

vt. 用止轮木使…停下

英文词源

sprag (n.)

"prop in a mine," 1841, of unknown origin. Transferred by 1878 to wood blocks, etc., used to brake motor vehicles. As a verb, from 1841. Related: Spragged; spragging.

双语例句

1. Roller bearing clutch is a new kind of frictional sprag clutch.

滚柱轴承离合器是一种新型的摩擦式超越离合器.

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