optimal tactic的用法和样例：
例句
- The effect of system parameters on the optimal policies and the optimal expected profit with substitutable demand are also discussed.
并讨论了此时的最优策略和最优利润随各参数的变化情况。 - Linear programming formulation is used to find the optimal solution, which maximizes the channel utilization while guaranteeing requirements of QoS con-straints.
用线性规划方法求解最优策略，从而在满足服务质量约束要求的同时最大化信道利用率。
