基于系统可估计性定义，本文根据有限测量信息的参数估计问题特点，提出了系统的参数可估计性定义；
The definition of parameter estimability is proposed for parameter estimation problem with finite measurement information based on the definition of system estimability.
最后分析了当测量变量有多组测量时对系统参数可估计性的影响，通过线性与非线性实例验证了分析结果的有效性。
The relationship between parameter estimability and the number of data sets is discussed. The effectiveness of the proposed analysis can be demonstrated by the results of linear and nonlinear systems.
我们从未估计到这种可能性。
我们必须实事求是地估计我们获胜的可能性。
一些科学家正在研究从南极洲收集冰山的可能性。据估计，南极洲拥有地球上最大的淡水储备。
Some scientists are examining the potential for harvesting icebergs from Antarctica, which is estimated to have the biggest reserves of fresh water on the planet.
相比之下，由于沉积作用在大陆地区的连续性要小得多，因此根据已知的上下岩层的年龄来估计一个大陆岩层的年龄风险更大。
By contrast, because sedimentation is much less continuous in continental regions, estimating the age of a continental bed from the known ages of beds above and below is more risky.
这些因素可能包括高管的激励性薪酬、董事会缺乏监督以及管理层在估计收购目标公司价值时的错误。
These factors may include the incentive compensation of executives, lack of monitoring by boards of directors, and managerial error in estimating the value of firms targeted for acquisition.
可用性权威JacobNielsen估计到，一个外部的可用性专家通常只能识别约35%的可用性问题。
Usability expert Jacob Nielsen estimates that a usability review by an outside expert only identifies 35% of usability problems.
然后，这些信息被包括进来，用于帮助优化器在为那些符合条件的查询(这些查询不需要直接引用视图)的选择性估计和基数估计计算成本时做决定。
This information can then be included as part of the optimizer decision during costing for selectivity and cardinality estimates for qualified queries which do not need to reference the view directly.
季节性流感死亡人数是估计值。
在估计安全性被破坏而造成的损失时，不要忘记安全性被破坏会导致系统用户对系统失去信心。
When estimating the damage of a security breach, never forget that security breaches can cause users to lose faith in the system.
我们使用不动产选项方法来估计这种可移植性带来的灵活性的价值。
Using a real options approach we estimate the value of the flexibility that such portability confers.
对于那些我们应该(合理)害怕的事情来讲，我们能很好的估计遇到风险的可能性，并且尽可能的避免风险。
For the things we should (rationally) fear, it is perfectly appropriate to want to assess the likelihood of encountering them, and to spend effort averting them.
全球变暖注定要比先前估计来得更早，毁灭性更大。关于气候变迁的最权威报告将在下个星期做这样的警告。
Global warming is destined to have a far more destructive and earlier impact than previously estimated, the most authoritative report yet produced on climate change will warn next week.
在估计安全性被破坏而造成的危害时，不要忘记安全性被破坏会导致系统用户对您的系统失去信心。
When estimating the damage of a security breach, never forget that security breaches can cause loss of faith in users of the system.
通过体验和观察做出结论的关键在于评估可能性，也就是估计可能性是否足够高，足以证明结论是客观的。
The art of concluding from experience and observation consists in evaluating probabilities, in estimating if they are high or numerous enough to constitute proof.
粗略估计大概一半气象站在建筑物林立区，这样一来会使气温上升出现夸张性的估计。
Many sceptics fear that, because roughly half of all weather stations are in built-up areas, this may have inflated estimates of a temperature rise.
最近几年，这样收集的重要性重新被估计，并且它们现在被认为是对地球上的生命有价值的记录。
In recent years, the importance of such collections has been re-evaluated, and they are now seen as a valuable record of life on Earth.
这意味着对随后项目估计的准确性受影响的可能性更低，而且随后项目被延迟的可能性也更低。
This means that the accuracy of the estimation of subsequent projects is less likely to be affected and there is less potential for delay in sequential projects.
研究结果表明，志愿者们对这些男性进攻性的估计与实际情况的相符度很高——即使他们只看了一眼照片。
The results revealed the participants' estimates of aggression correlated highly with the actual aggressive behaviour of the men - even if they only saw the picture for a split second.
但是一旦这些疾病发生在新生儿身上，就是灾难性的，据估计，占新生儿死亡病例的百分之20。
But when they strike newborns, they can be devastating, accounting for an estimated 20 percent of infant deaths.
而志愿者对男性进攻性的估计与脸部的宽高比也相符。脸部越宽，进攻性评级越高。
And the volunteers' estimates also matched with the WHR of the faces the wider the face, the higher the aggressive rating.
为此，可以在where子句中将关键字SELECTIVITY放在谓词的后面，后面带一个0到1之间的对选择性的估计值。
To that end, you can append the selectivity keyword right after the predicate in the WHERE clause, followed by an estimated or guessed selectivity value in the range of 0 and 1.
由于真实数据关系的复杂性，估计值不总是准确的，但是有许多工具和技术可以改进它们。
Due to the complexity of real-world data relationships, it is not always possible for estimates to be perfect, but there are a number of tools and techniques available to improve them.
冈比亚在1978- 1979年发生黄热病疫情之后，曾进行过一次以村庄为基础的血清回顾性研究，估计出现过8000个病例，有1700人死亡。
After the Gambia yellow fever outbreak in 1978-1979, a village-based serological retrospective study estimated some 8000 cases and 1700 deaths had occurred.
依据团队的经验和项目的新颖性程度，这些估计差不多是正式的。
These estimates can be more or less formal depending on the team's experience and the project's degree of novelty.
当查询性能中出现例外情况时，优化指南和统计视图特性对于弥补访问计划估计的不准确性非常有用。
Optimization guidelines and statistical views are useful features to compensate the access plan evaluations when exceptions in query performance occur.
而且也存在发现未知宝藏的可能性，据估计，还有75%的遗迹未被发掘。
There's also the potential for finding unknown treasures. By some estimates, as much as 75 percent of the site has yet to be excavated.
而且也存在发现未知宝藏的可能性，据估计，还有75%的遗迹未被发掘。
There's also the potential for finding unknown treasures. By some estimates, as much as 75 percent of the site has yet to be excavated.
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