In the following block diagram, R(s) and D(s) are two inputs. The output Y(s) is expressed as Y(s) = G1(s)R(s) + G2(s)D(s). G1(s) and G2(s) are given by

The block diagram of a system is illustrated in the figure shown, where X(s) is the input and Y(s) is the output. The transfer function H(s)=Y(s)/X(s) is

Mr. X speaks _________ Japanese _________ Chinese.