这是因为我所做的自底向上的详细估算可能会出错。
This is because my detailed, bottom-up estimates are probably wrong.
当详细设计进行到一定阶段，最根本的详细设计已经完成时，就要基于项目的明确范围进行详细估算。
When the detailed design has progressed to a point when the essential details are known, a detailed estimate is made on the basis of the well defined scope of the project.
详细估算或者称为明确估价是在工程范围基本明确、详细设计正在进行、项目的基本特征已经确定时做出的。
The detailed estimate or definitive estimate is made when the scope of work is clearly defined and the detailed design is in progress so that the essential features of the facility are identifiable.
因而，在工程师估算完成前的相当长时间里，只能用详细估算来作为控制预算，因为详细估算也能充分明确地反映项目的范围。
Consequently, the detailed estimate is often used as the budget estimate since it is sufficient definitive to reflect the project scope and is available long before the engineer's estimate.
这项工程需要作详细的成本估算。
要计算这样的估算准确率，团队必须要耗费精力获得详细的“实际”工作小时数，我可从没有见过哪个敏捷实践倡议说要这样做。
To calculate this kind of estimate accuracy, teams would have to expend effort to capture detailed "actual" hours, a practice not advocated by any Agile approach I've seen.
此外，我们还列举了一个例子来详细说明如何收集片段实绩信息，以了解实绩基数与优化器所估算的基数之间的差别。
In addition, we include a detailed example of how you can gather section actual information to see real cardinality vs. the cardinality estimated by the optimizer.
构建阶段的迭代计划足够详细，使得工作可以继续开展，并被具体的估算所支持。
The iteration plans for the Construction phase are of sufficient detail to allow the work to proceed, and are supported by credible estimates.
只对估算中表现出最大风险、最大成本或最大范围的一些组件进行详细分析和估算。
Analyse and estimate only some components in more detail as these represent the biggest risk, the biggest cost or the biggest range in the estimate.
这个方法并不生成一个详细的估算，但它提供了一个足够精确的推测来比较项目或是决定是否启动一个项目。
The approach does not produce a detailed estimate but it does provide an accurate enough guess to compare projects or to decide whether to start a project.
详细成本估算中的具体项次成为工作成本要素。
Specific items in the detailed cost estimate become job cost elements.
这些是用非对称的波动性，相互关联和在虚拟实验室其他部分相似的方法估算出来的(计量经济学详细资料见布朗利和恩格尔2010)。
These are estimated using asymmetric volatility, correlation and copula methods similar to those in other sections of VLAB (for econometric details see Brownlees and Engle 2010).
在实际操作当中，无论详细的成本估算中是否包括了意外事件，项目预算都应列支一笔应急储备金。
Realistically, a budget accounting item for contingency allowance should be established whenever a contingency amount was included in the final cost estimate.
当然，在不同的估算中对每项工作分解的详细程度可能会有很大差别。
The level of detail in decomposing into tasks will vary considerably from one estimate to another.
当详细的项目信息有限时(如在项目早期阶段)，经常使用这种方法对某一参数进行估算。
It is frequently used to estimate a parameter when there is a limited amount of detailed information about the project (e. g., in the early phases).
当详细的成本估算是按照外部的汇报要求而不是按照组织内部现有的成本报告来编制时，其情况就更加如此。
This is particularly true when final cost estimates are prepared in accordance with an external reporting requirement rather than in view of the existing cost accounts within an organization.
详细分析了天线的辐射特性，给出了天线辐射波束相关参数的估算公式和天线设计公式；
The radiation patterns of the antenna are analyzed, and the formulas to estimate the wave beam parameters and to design the antenna are provided.
此外，建立在组织内部的成本报告种类同详细的成本估算中的数量很少有相似之处。
Moreover, the categories of cost accounts established within an organization may bear little resemblance to the quantities included in a final cost estimate.
本文还详细介绍了碎石振冲桩法加固松软地基的施工过程，探讨了填料用量的估算、桩位布设、加固深度等技术问题。
The paper also introduces in greater detail the construction process of strengthening spongy foundation by using the method and discusses some technical problems.
详细介绍了烟囱倒向偏差估算、纠偏措施和支撑体的强度校核。
The estimation of deviation of toppling direction, rectifying deviation measures and strength check of the support part of blasting cut in sloping brick chimney demolition were introduced in detail.
准备详细的书面报告，估计属性值，成本，概述的方法，估算了，并满足评价标准。
Prepare detailed written reports that estimate property values, costs, outline methods by which the estimations were made, and meet appraisal standards.
我们将免费拟一份提案，其中包括详细的成本估算。
We'll put together a proposal, including detailed costings, free of charge.
根据子波振幅谱估算最小相位子波已有多种方法，本文对用希尔伯特变换法、同态法、零相位子波法、松弛迭代法等估算的最小相位子波，进行了详细的分析。
Among the methods for estimating the minimum phase wavelet from its amplitude spectrum, methods of Hilbert-transform, of homomorphy, of zero-phase wavelet and of relaxation-iteration are analysed.
详细介绍了评价自发呈报中不良反应漏报的方法、分母的估算、分子与分母的一致性及分母单位的选择。
The methods of estimation of under-reporting, estimation of denominator, consistency between the numerator and denominator and selection of the unit of measurement were discussed at length.
对贵阳地区某别墅空调冷负荷进行详细计算，计算结果可作为贵阳地区相似建筑夏季空调冷负荷估算的参考值。
Through a real air condition cold load calculation example of a villa, the paper provides a reference of air condition cold load per square meter in summer of Guiyang.
详细论述了各观测项目增设、改造及自动化设计的实施方案，给出了相应的精度估算。
It has a detailed discussion about the increasing and remodelling and automatic design of the observation project. At last, it shows the correspond accuracy prediction.
在此基础上，结合电力信息网络对网络带宽的要求，提出了基于排队论和服务质量的网络带宽估算方法，并以IP电话为例，给出了详细的计算过程。
The prevailing electricity information network is a service network based on IP technology while incapable of satisfying the end-to-end quality of service(QoS)requirements of different applications.
本文基于多层神经网络计算模型 ，提出了一种新的飞机主要参数的估算方法 ，并给出了实现这种方法的详细步骤。
This paper chiefly describes the structure, the working principle and main parameters' design process of XL1000 fine coal centrifuge.
本文基于多层神经网络计算模型 ，提出了一种新的飞机主要参数的估算方法 ，并给出了实现这种方法的详细步骤。
This paper chiefly describes the structure, the working principle and main parameters' design process of XL1000 fine coal centrifuge.
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