mass-en.er.gy equivalence
mass-energy-equivalence的音标和读音：
DJ音标发音： [ˈmæsˈenədʒi:]
KK音标发音： [ˈmæsˈɛnɚdʒi]
mass-energy-equivalence的词性：
n.（名词）
1. The physical principle that a measured quantity of energy is equivalent to a measured quantity of mass. The equivalence is expressed by Einstein's equation, E = mc2, where E represents energy, m the equivalent mass, and c the speed of light.
质能相当性：一定标准的能量等于一定标准的质量的物理原理。爱因斯坦的质能当量的等式是，E＝mc2，在此E代表能量，m为同等质量，c为光速