英语词汇“protactinium”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	protactinium
释义	protactinium noun /ˌprəʊtækˈtɪniəm/ /ˌprəʊtækˈtɪniəm/ [uncountable] (symbol Pa) jump to other results a chemical element. Protactinium is a radioactive metal found naturally when uranium decays . Word Originearly 20th cent.: from proto- ‘original, earlier’ + actinium, so named because one of its isotopes decays to form actinium.
随便看	cowbell cowboy cowboy boot cowboy-boot cowboy hat cowboy-hat cowboys and Indians cowboys-and-indians cowcatcher cow chip cow-chip cowed cower Cowes cowes cowgirl cowhand cowhide co-wife cowl cowlick cowling cowl neck cowl-neck co-worker

英语词典包含84843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。