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at (the) first

a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
同义词： astatine At atomic number 85
100 at equal 1 kip in Laos
同义词： at

a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

同义词：astatineAtatomic number 85

100 at equal 1 kip in Laos

同义词：at

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