Then, through solving the slow time-scale problem by optimal control theory, the optimal reduced-order reference trajectory is obtained.

然后，应用最优控制理论得出慢时间尺度上的解，并将其作为降维后的最优参考轨迹；

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Based on MDS water allocation model, the large-scale watershed real time dynamic water allocation can be realized, whereby providing a reference for the watershed planning and management.

基于MDS的配水模型，可以实现大型流域实时动态配水，为流域的规划和管理提供参考。

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Geologists have devised a special geological time scale in reference to the earth's evolution.

地质学家们根据地球的演化历史，设计出一种特殊的地质年代表。

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The fact that there has not been a big terrorist attack against the West since the one in Madrid last March does not mean that the threat has gone away: as Osama bin Laden's reference to the wrongs done to Muslims in 8th-century Andalucia shows, Islamist terrorists work on a longer time-scale than most people.

ECONOMIST: Terror suspects in Britain