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Different understandings lead to different methodologies, which sometimes complement each other.

The two of them worked very efficiently together. In just three days, they had built a 'mass point' system, using mass points as the unit to explain the shapes of particles, rather than just the compositions of marginal energy units.

The energy unit, by definition, is too minute.

Even relative to the most basic particles, energy units are still negligible. Discussing particles in terms of energy units and compositions would seem to leave something missing. This is because it's impossible to precisely define the connection between the edges of particles and energy points, not to mention the core of a particle was never defined.

With the concept of mass points, energy points can be used to form mass points, which in turn form particles of different shapes.