| 单词 | perpetual |
| 释义 | perpetual adj. 1. eternal; lasting for ever or indefinitely. 2. continuous, uninterrupted. 3. colloq. frequent, much repeated (perpetual interruptions). 4. permanent during life (perpetual secretary). Phrases and idioms perpetual calendar a calendar which can be adjusted to show any combination of day, month, and year. perpetual check Chess the position of play when a draw is obtained by repeated checking of the king. perpetual motion the motion of a hypothetical machine which once set in motion would run for ever unless subject to an external force or to wear. Derivatives perpetualism n. perpetually adv. Etymology: ME f. OF perpetuel f. L perpetualis f. perpetuus f. perpes -etis continuous |
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