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We consider the steady Navier-Stokes equations in a 2-dimensional unbounded multiply connected domain $\Omega$ under the general outflow condition. Let $T$ be a 2-dimensional straight channel $ℝ\times (-1,1)$. We suppose that $\Omega \cap \{x_1<0\}$ is bounded and that $\Omega \cap \{x_1>-1\}=T\cap \{x_1>-1\}$. Let $V$ be a Poiseuille flow in $T$ and $\mu$ the flux of $V$. We look for a solution which tends to $V$ as $x_1\to \infty$. Assuming that the domain and the boundary data are symmetric with respect to the $x_1$-axis, and that the axis intersects every component of the boundary, we have shown the existence...