单词 | element 109 |
释义 | element 109 (once / 5909656 pages) n WORD FAMILY element 109 n a radioactive transuranic element Syn|Hyper Mt, atomic number 109, meitnerium chemical element, element any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
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