  We declare that we are living in the quantum 4-dimensional Minkowski
space-time with the force-fields gauge-group structure $SU_c(3) \times SU_L(2)
\times U(1) \times SU_f(3)$ built-in from the very beginning. From this overall
background, we see the lepton world, which has the symmetry characterized by
$SU_L(2) \times U(1) \times SU_f(3)$ - the lepton world is also called "the
atomic world". From the overall background, we also see the quark world, which
experiences the well-known $(123)$ symmetry, i.e., $SU_c(3) \times SU_L((2)
\times U(1)$. The quark world is also called "the nuclear world".
  The $3^\circ\,K$ cosmic microwave background (CMB) in our Universe provides
the evidence of that "the force-fields gauge-group structure was built-in from
the very beginning". The CMB is almost uniform, to the level of one part in
$10^5$, reflecting the massless of the photons.
  The lepton world is dimensionless in the 4-dimensional Minkowski space-time.
That is, all couplings are dimensionless. The quark world is also dimensionless
in the 4-dimensional Minkowski space-time. Apart from the "ignition" term, the
gauge and Higgs sector, i.e., the overall background, is also dimensionless.
Thus, apart the "ignition" term, our world as a whole is dimensionless in the
4-dimensional Minkowski space-time - that is, it is the characteristic of the
quantum 4-dimensional Minkowski space-time.
