单词：upgrade system
upgrade system的用法和样例：
例句
- Study on Optimum Decision Method of MSW Management System.城市固体废弃物处理系统优化决策方法研究。
- The stress of this paper is laid on the practice value of The great system optimization from macroscopic view.本文着重从宏观角度论述大系统优化方法的实际应用价值。
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