| 单词 | mass-energy conservation | 
| 释义 | mass-energy conservation [`mas `en·ǝr·jē ´kän·sǝr´vā·shǝn]  RELATIVITY The principle that energy cannot be created or destroyed; however, one form of energy is that which a particle has because of its rest mass, equal to this mass times the square of the speed of light.  | 
	
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