Pitchblende and chalcolite are much more radioactive than uranium itself.
沥清铀矿和铜铀云母比纯铀的放射性强得多.
辞典例句
英英释义
Noun
1. a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore
