系统总费用有它的最小值，这时对应的服务率是最优值。
The total system fee has least value and the corresponding service rate is the optimized value.
利用案例中给出的护理人员平均服务率，计算他们一个星期的平均劳动率。
Using the average service rate for nurse practitioners given in the case, compute their utilization rate averaged over the whole week.
孕产服务因下降的出生率而将被削减。
Maternity services were to be reduced as a consequence of falling birth rates.
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