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单词 roentgenium
释义 roent·gen·iumBrE /ˌrɒntˈɡiːniəm/NAmE /ˌrentˈɡiːniəm/ noun [U] (symbol Rg) a chemical element. Roentgenium is a radioactive element that is produced artificially and has no known use 𬬭(一种人工合成的放射性化学元素)
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