| 单词 | thorium | 
| 释义 | thorium [`thȯr·ē·ǝm]  CHEMISTRY An element of the actinium series, symbol Th, atomic number 90, atomic weight 232; soft, radioactive, insoluble in water and alkalies, soluble in acids, melts at 1750°C, boils at 4500°C.  METALLURGY A heavy malleable metal that changes from silvery-white to dark gray or black in air; potential source of nuclear energy; used in manufacture of sunlamps.  | 
	
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