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radiothorium [ˌreɪdiəʊ'θɔːriəm, -oʊ'-] n
gen. 放射性钍 (RdTh, 钍的同位素 Th²²⁸)
chem. 射锭
earth.sc. 放射性钍; 射钍钍同位素 Th²²⁸
oil 放射钍; 射钍

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