  Based upon our recent study on the Lorentz non-invariance ambiguity in the
longitudinal weak-boson scatterings and the precise conditions for the validity
of the Equivalence Theorem (ET), we further examine the intrinsic connection
between the longitudinal weak-boson scatterings and probing the electroweak
symmetry breaking (EWSB) mechanism. We reveal the profound physical content of
the ET as being able to discriminate processes which are insensitive to probing
the EWSB sector. With this physical content as a criterion, we analyze the
sensitivities to various effective operators for probing the mechanism of the
EWSB.
