The positive feedback effect between the traffic demand and the traffic supply makes the road net plan hard to suit the future traffic demand.

交通需求与交通供给之间的正反馈效应，使得路网规划方案难以适应交通需求的变化。

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For the system with only positive feedback, we find there is a kind of relationship between the bistability and the effect of the stimulus.

对于仅有正反馈的系统，我们发现其产生可逆性与不可逆性双稳与外部激励作用的方式有着密切的关系。

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Based on theory of system dynamics, the causal loop diagrams of manpower, technology, money and market flows are analyzed together with positive feedback of industrial agglomeration effect.

以系统动力学理论为基础，结合产业集聚效应的正反馈特征，对人才流、技术流、资金流和市场流的因果关系进行了探讨。

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The unpredictable positive feedback effect of being first, achieving meteorically rapid scale makes picking winners hard.

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Here, the literature also points to a positive feedback effect with decisive expenditure-based fiscal consolidation because this type of consolidation appears to foster growth, in particular in times of severe fiscal imbalances.

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That is, there would be a positive feedback effect from health reforms and efficiencies - above all at the demand level by addressing ill health - and a negative one from failing to do so. (If anybody can calculate what 12.5% would be in today's money, then we know the difference between the Wanless "worst case" and what Mr Lansley warns about today).

BBC: Health Bill: Where's the strategic argument?