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gen. radiothorium (RdTh, 钍的同位素 Th²²⁸)
射钍 shètǔ
chem. RdTh
oil radiothorium
射钍钍同位素 Th²²⁸ shètǔ
earth.sc. radiothorium
射 钍
: 11 phrases in 5 subjects
Chemistry1
Earth sciences2
Metallurgy2
Oil / petroleum2
Technology4