  The determination of the $Zb\bar{b}$ coupling in experiments has been a
long-standing challenge, as the limited precision of off $Z$-pole measurements
at the LEP has resulted in two degenerate solutions remained to be resolved. In
this paper, we propose a novel method to probe the $Zb\bar{b}$ coupling by
measuring the forward-backward asymmetry of the bottom quark,
$A^{b}_\text{{FB}}$, in the $b\bar{b}$ system of the $e^+ e^- \to b \bar{b}
\gamma$ and/or $e^+ e^- \to b \bar{b} g$ processes at the $Z$-pole of future
lepton colliders. The additional hard photon or light jet radiation can mimic
the energy scanning of the $e^+e^-\to b\bar{b}$ process, and the $A_{\rm FB}^b$
distribution from the $\gamma$-$Z$ interference process is linearly sensitive
to the $Zb\bar{b}$ coupling. By combining the expected measurements of $R^0_b$
and $A^{0,b}_\text{{FB}}$ at the $Z$-pole at the CEPC, the $A^{b}_\text{{FB}}$
distributions can break the degeneracy observed at the LEP, leading to a unique
determination of the $Zb\bar{b}$ coupling through $Z$-pole running alone.
