The present invention provides a method of preparing the copper-containing hydrogenation catalyst having high activity by liquid phase reduction without decreasing purity of the solvent and a method for efficiently producing an alcohol. The front substrate has multiple first and second common electrodes respectively connected to a first and a second contact pads. The male and female models can be expressed in terms of a vector representing key values defining each speech model and the derived transformation can be in the form of a matrix that would transform the vector of the male model to the vector of the female model. The pivot unit is provided on the stationary and pivotable members to permit pivoting movement of the pivotable member relative to the stationary member about a pivot axis between a footwear tightening position and a footwear loosening position. More specifically, an automatic system for refurbishing a plurality of disc surfaces at substantially the same time, such that when refurbished, an optical reader, which uses a laser to read digital information stored on such a disc, can read the digital information on the disc without the optical distortion caused by a scratch. This sub-word method allows for rapid stopping of the prompt to improve automatic speech recognition and reduce speaker confusion andor frustration.