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We use the standard Runge-Kutta method to solve the set of basic equationsdescribing black hole accretion flows composed of two-temperature plasma. We donot invoke any extra energy transport mechanism such as thermal conduction anddo not specify any ad hoc outer boundary condition for the advection-dominatedaccretion flow (ADAF) solution. We find that in the case of high viscosity andnon-zero radiative cooling, the ADAF solution can have an asymptotic approachto the Shakura-Sunyaev disk (SSD) solution, and the SSD-ADAF transition radiusis close to the central black hole. Our results further prove the mechanism ofthermal instability-triggered SSD-ADAF transition suggested previously byTakeuchi & Mineshige and Gu & Lu.Comment: 10 pages, 2 figures, accepted for publication in ApJ Letter

The Shakura-Sunyaev Disk Can Smoothly Match an Advection-dominated Accretion Flow