However, in order for this unification to work mathematically, it requires that force-carrying particles have no mass.
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.
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。
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