the table indicates different satisfaction degrees to jobs of employees in a certain company. To be specific, the satisfaction rate of workers over fifty years old is 40%.On the contrary, the dissatisfaction proportion of employees whose age are between 41 to 50 accounts for 64%. Isolated as the table seem to be, as a matter of fact, they are connected to one another closely. What exactly contribute to such a phenomenon? It is a thought-provoking question. For one thing,the salary employer paid is so low that employers cannot support their families. For another,