“perpetual calendar”的概念、定义、翻译、参考文献-科学参考

单词	perpetual calendar
释义	perpetual calendar [pǝr`pech·ǝ·wǝl `kal·ǝn·dǝr] ^ASTRONOMY A table or mechanical device used to determine the day of the week corresponding to any given date over a period of many years.
随便看	piloting pilot lamp pilotless aircraft pilot light pilot lightship pilot line operation pilot materials pilot model pilot motor pilot plant pilot production pilot reaming bit pilot relaying pilot report pilot rules pilot-scale chemical reaction pilot station pilot streamer pilot system pilot test pilot tone pilot tunnel pilot vessel pilot waters pilot wire regulator

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