不过，为了使这二者的统一符合数学计算，需要负责传递力的粒子质量为零。
However, in order for this unification to work mathematically, it requires that force-carrying particles have no mass.
显然光子的一个主要区别于其它粒子的特征就在于它的静止质量为零。
Evidently one of the main distinguishing characteristics of photon is just its zest rest mass.
实物粒子是指静止质量不为零的微观粒子，如电子、原子和分子等。
The object particle means to the microcosmic particle that its static mass is not zero, for example, electron atom molecule and so on.
在爱因斯坦引力理论下，引力子为零质量的张量粒子，它导致了粒子之间存在着正比于能量的引力作用。
In general relativity theory, graviton is the massless tensor particle, which results in gravitation action in proportion to the energy.
在爱因斯坦引力理论下，引力子为零质量的张量粒子，它导致了粒子之间存在着正比于能量的引力作用。
In general relativity theory, graviton is the massless tensor particle, which results in gravitation action in proportion to the energy.
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