a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
TH的用法和樣例：
例句
Th woman was delighted at the recovery of her stolen jewels. 那位婦人對找回被盜的珠寶感到非常高興。
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