当概率分布未知时，就存在不确定性。
Uncertainty occurs when the probability distribution is unknown.
指南的作者群称科学仍存在不确定性。
The guidelines' authors said the science remained inconclusive.
两边都存在不确定性。
坝基局部扬压力异常机理的分析中通常存在不确定性。
Uncertainty may exist in dealing with the mechanism of local uplift anomaly on dam foundation.
银行的股票价格在优先股还没被偿付的时期内当然还存在不确定性。
Banks' share prices would, of course, remain uncertain while preferred shares were outstanding.
探讨了水文系统和输入存在不确定性的灰色系统分析问题。
This paper is concerned with a hydrological grey system analysis involving the uncertainty of both the system model and input-output.
实际上，并购策略有时被采用是由于竞争性环境中存在不确定性。
In fact, an acquisition strategy is sometimes used because of the uncertainty in competitive landscape.
但这种评价存在不确定性，有较大的偏差性，有随机性等缺点。
However, this evaluation method had some disadvantages of the uncertainties, with a quite deviation and randomness.
基于此充分条件，又给出了系统存在不确定性时正实控制器的设计方法。
Based on this condition, the design method of positive real controller for uncertain discrete singular systems with state delays is obtained.
以价格竞争模型为基础，研究了在产品市场存在不确定性时债务的战略效应。
On the basis of price competition model, the strategic effect of debt under the condition of uncertainty was analyzed.
讨论了一种概率信息系统用于表示对象与属性值之间的关系存在不确定性的信息。
Probability information systems, which are used to represent the uncertainty information between objects and attributes, are discussed.
但是，对于影响的强度，特别是在剂量远低于约100mS v时，存在不确定性。
However, there are uncertainties concerning the magnitude of the effect, particularly at doses much lower than about 100 mSv.
在历史洪水存在不确定性情况下，以概率权重矩法估计的参数稳健性优于优化适线法。
Moreover, under the situation of uncertainties in large historical flood, the quantities estimated by probability weighted moments may be more robust than those by a optimal curve fitting method.
本文研究了一类在控制和状态矩阵中同时存在不确定性的时滞系统的鲁棒稳定化控制问题。
In this paper, the robust stabilization problem for a class of time-delay systems with uncertainties in both the control matrix and the state matrices is considered.
我国立法有关合同形式要求规则的规定存在不确定性，应根据其功能从不同的方面加以完善。
In our country, the stipulation of the related principle of the contract form requirement is uncertain, so it should be perfected in different ways on its functions.
仿真结果表明：即使系统存在不确定性和外界干扰，仍可在闭环系统中实现精确的姿态控制。
Simulation results show that, in the closed-loop system, precise attitude control is accomplished in spite of the uncertainties and external disturbances in the system.
传统上，收购方的价值会下降，因为收购会产生费用，而且收购能否带来收益存在不确定性。
Traditionally, companies that acquire another lose value because of the expense along with the uncertainty about making the deal pay off.
法律诉讼以过去事项为依据，但在诉讼最终解决之前，公司负债(如果有)的金额存在不确定性。
The lawsuit is based upon past events, but until the suit is resolved, uncertainty exists as to the amount (if any) of the company's liability.
这项构想于经济回转之际的工程，由于当地楼市崩盘和即将实施的财政紧缩计划，也存在不确定性。
The project, conceived at a time when the economy looked brighter, is not without its uncertainties, thanks to a local collapse in property values and the fiscal tightening ahead.
在过程存在不确定性时，在周期信号作用的频率域内根据过程的频率响应，设计了有效的控制器。
In the presence of process model uncertainties, the efficient controller can be designed by using the frequency response of the process at the frequences defined by the periodic signals.
因此，世卫组织已经决定让出发言权。因为流感的标准存在不确定性，所以这样做或许也不是一件坏事。
So the WHO has decided to play it by ear, and given the unpredictability of flu, this is probably not a bad thing.
有关克隆动物的健康状况及生命周期仍存在不确定性；绵羊多莉2003年就曾因癌症及关节炎过早死去。
Uncertainties about the health and life span of cloned animals persist; Dolly died prematurely in 2003 after developing cancer and arthritis.
她说，当存在不确定性时，印度科学家在做出推论方面犹豫不决，相反却愿意保持四平八稳，在措施和评估上出言谨慎。
The country's scientists hesitate to draw inferences when there is uncertainty, she says, instead preferring to play it safe and be cautious in their words and assessments.
她说，当存在不确定性时，印度科学家在做出推论方面犹豫不决，相反却愿意保持四平八稳，在措施和评估上出言谨慎。
The country's scientists hesitate to draw inferences when there is uncertainty, she says, instead preferring to play it safe and be cautious in their words and assessments.
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