  Based on recent $W$-mass measurements, the electroweak theory is tested at
non-trivial quantum correction level, i.e., beyond the Born approximation with
$\alpha(M_Z)$ instead of $\alpha$. We can conclude that some non-Born type
corrections must exist at more than 92 % confidence level, and the
non-decoupling top-quark corrections are required at 97 % confidence level.
