For indistinguishable particles, the wave function of them should be symmetric or antisymmetric, but in the real world, this might require that all the same type of particles should be considered when solving a specific problem, so I am trying to figure out when could I treat two particles as distinguishable. If the wave function of two particles is not overlapped, it would make sense to treat them as distinguishable, but what if they are overlapped not totally, only partially, would they be distinguishable?