extra expense短语⁷⁹⁹⁷⁸⁺⁹ 基本例句 特别费用 Finally, we have done simulations of E- MSC algorithm. The results of simulations show that: Compared to the algorithm G- MSC, E-MSC can improve the network lifetime without any extra expense. 最后本文通过仿真验证了：算法 E- MSC与目标覆盖算法 G- MSC相比在网络生命周期方面有一定的提高。 fabiao