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-现代词典

单词	protactinium
释义	protactinium noun uncountable chemistry UK /ˌprəʊtækˈtɪniəm/ DEFINITIONS1 1 a chemical element that is a radioactive metal. Its symbol is Pa. Synonyms and related words Chemical elements actinium alkali metal aluminium protactinium noun uncountable chemistry US /ˌproʊtækˈtɪniəm/ DEFINITIONS1 1 a chemical element that is a radioactive metal. Its symbol is Pa. Synonyms and related words Chemical elements actinium alkali metal aluminum
随便看	knock-knock joke knock off knock-off knockoff knock-on knock on wood knock out knockout knock over knock someone for a loop knock someone for six/knock someone sideways knock someone off their pedestal knock someone/something into a cocked hat knock (someone’s) heads together knock some sense into someone knock something on the head knock the breath/wind out of someone knock the stuffing out of someone knock together knock up knock-up knock your socks off knock/throw someone for a loop knock ’em dead knoll

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