  Inspired by the vector-like phenomenon of chiral gauge theories at short
distances, we postulate that the $W^\pm$-gauge boson has a vector-like gauge
coupling in the high-energy region, beside its purely right-handed gauge
coupling observed in the low-energy region. It is discussed that the top quark
acquires its mass via spontaneous symmetry breaking, while the $u,d,c,s,b$
quarks acquire their masses via explicit symmetry breakings. We discover four
relationships between four inter-generation mixing angles and six quark masses
by examining Dyson equations for quark self-energy functions. A preliminary
analysis shows that the hierarchical pattern of quark masses is closely related
to the hierarchical pattern of inter-generation mixing angles. In particular,
the CP-violating phase is predicted to be approximately 79$^\circ$.
