英语词汇“proper motion”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	proper motion
释义	WordReference Random House Unabridged Dictionary of American English © 2024 prop′er mo′tion, Astronomythe angular motion of a star relative to a suitably defined frame of reference, expressed in seconds of arc per year. Cf. tangential motion. 1595–1605 Collins Concise English Dictionary © HarperCollins Publishers:: proper motion n the very small continuous change in the direction of motion of a star relative to the sun. It is determined from its radial and tangential motion
随便看	cost-efficiently costello coster costermansville costermonger costing cost, insurance, and freight costive costively costiveness cost-justifiable cost-justify cost keeper cost keeping cost ledger costless costlessness costliness costly costmary costner costo- cost of living cost-of-living cost-of-living index

英语词典包含188688条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。