| 释义 |
〔retreat〕The process of going backward or receding from a position or condition gained.撤回原位的过程：从已获得的位置或状况中后移或退却的过程〔pawl〕A hinged or pivoted device adapted to fit into a notch of a ratchet wheel to impart forward motion or prevent backward motion.掣爪，棘爪：一种枢轴或转轴器械，能与齿轮缺口或齿间吻合来前进或防止后移 |