Many physicists focused on this conundrum, trying to formulate a theory that would represent the symmetry properties of subatomic forces while also incorporating massive particles.

• 很多物理学家一心一意想解决这个问题，他们的目标是建构一个理论，它既能够保有次原子核力的对称性，同时也能够包容带质量的粒子。