Meanwhile, as some states can not be estimated or have poor estimation, the simplified state equation employed in the alignment process will cause model parameter uncertainty.

同时，由于一些状态不可估计或估计效果很差，采用简化状态方程进行对准，存在着模型参数不确定性。

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Negative outcome that has a known or estimated probability of occurrence based on experience or some theory. The likelihood of loss as a consequence of uncertainty.

是一个负面的结果，由一个已知或估计的概率发生的基础上的经验或一些理论。这种可能损失作为结果是不确定的。

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With this method, the test data uncertainty can be estimated rapidly. A basis for safe design and test quality control method can be provided for users to analyze test data.

利用该方法不仅可以迅速地估算出试验数据的不确定度，为用户提供安全设计依据，而且还可以为风洞人员提供有效的试验质量监控方法。

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Since the terror attacks in the US on 11 September, there has been unparalleled uncertainty in the aircraft industry with an estimated 20, 000 jobs disappearing worldwide.

BBC: Airbus warns of 1,300 job losses

Such uncertainty makes tax planning--and calculating quarterly estimated tax payments for 2006--difficult, to say the least.

FORBES: Magazine Article

Economic uncertainty and a violent drug war against cartels that has claimed an estimated 40, 000 lives also are credited for La Santa Muerte's growth.

WSJ: Underworld saint becoming more popular in US