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小测验：选择正确的单词
- 论坛新贴
astatine ['æstəti:n]
基本释义
- n. 石厄
砹
英英解释
1个名词解释
- a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
[同] astatine, at, atomic number 85
- a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium