  We explore the squeezed back-to-back correlation (SBBC) and investigate how
the squeezing effect influences the Hanbury Brown-Twiss (HBT) interferometry
using an expanding Gaussian source with non-zero width. The SBBC and HBT of
$D^0$ and $\phi$ mesons with finite in-medium widths are studied. The expanding
flow of the source may enhance the SBBC strength of $D^0{\bar D}^0$ and
$\phi\phi$ in the low momentum region but suppress the SBBC in the larger
momentum region. The squeezing effect suppresses the influence of flow on the
HBT radii, which is significant for two identical bosons with large pair
momentum or with large mass. Due to the squeezing effect, the relationship
between the HBT radii and the pair momentum exhibits non-flow behavior for
$D^0D^0$ pair. Likewise, non-flow behavior also appears in the HBT radii of
$\phi\phi$ with large pair momentum. This phenomenon may bring new insights for
studying the squeezing effect.
