sprag
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.
实用例句
- 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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