<image> (2013•Hangzhou) Quadrilateral ABCD is a right-angled trapezoid with AB∥CD and AB⊥BC, and BC=CD=2, AB=3. Trapezoid ABCD is rotated around lines AB and CD respectively for one full turn. The surface areas of the resulting geometric solids are S_{1} and S_{2}, then |S_{1}-S_{2}|=____ (square units).