Over the past two years, the central Treasury deposit balance has shown two features, seasonal change and a constant high level.

近两年，中央国库存款余额呈现出季节性变化和常年处于较高水平这两个特点。

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The problem is decomposed into a two-level optimization problem by constraints substitution introduction of functions of batch sizes and relaxation of material balance constraints.

通过约束变换、引入操作批量的函数和松弛物料存贮能力约束，将调度问题分解为一个两层次的优化问题。

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The new world order from concept of realism balance the power as the central building and other single-stage, two-stage, multi-level theoretical models of world order.

新现实主义的世界秩序观以权力、均势等为中心构建单级、两级、多级世界秩序的理论模式。

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