  In the framework of the one-boson-exchange model, we have studied the
interaction of the $B^*\bar{B}$ and $B^*\bar{B}^{*}$ system. After considering
the S-wave and D-wave mixing, we notice that both $Z_b(10610)^\pm$ and
$Z_b(10650)^\pm$ can be interpreted as the $B^*\bar{B}$ and $B^*\bar{B}^{*}$
molecular states quite naturally. Within the same framework, there also exist
several molecular charmonia including X(3872) and several other molecular
bottomonia, which are the partners of $Z_b(10610)$ and $Z_b(10650)$. The
long-range one-pion-exchange force alone is strong enough to form these loosely
bound molecular states, which ensures the numerical results quite
model-independent and robust.
