  We reveal the quark exchange effects related to both the kinetic energy and
various interactions in the single flavored dibaryon bound states with $^1S_0$
in the quark models. The hadron covalent bond can be established by the shared
identical quarks due to the quark exchange effect between two colorless
baryons. Such hadron covalent bond plays a decisive role in the deuteronlike
di-$\Omega_{ccc}$ and di-$\Omega_{bbb}$ covalent molecule states. The
$\sigma$-meson exchange is indispensable in the deuteronlike di-$\Delta^{++}$
and compact di-$\Omega$ states. The hadron covalent bond clearly appears in the
di-$\Delta^{++}$ state but is hidden in the di-$\Omega$ state. The
chromomagnetic interaction is always repulsive in the di-$\Delta^{++}$,
di-$\Omega$, di-$\Omega_{ccc}$, and di-$\Omega_{bbb}$ states. The
color-electric interaction is strongly attractive in the di-$\Omega$ state but
weakly attractive or repulsive in the di-$\Delta^{++}$, di-$\Omega_{ccc}$, and
di-$\Omega_{bbb}$ states.
