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Problems of generalisation can be reduced if teaching focuses on the principles that underlie concepts...

首先，去玩的时候，，孩子妈妈就告诉我她的女儿昨天又去sleep over了。

The dissertation focuses on performance gradient estimation and SRO algorithm of DES aswell as other related topics,such as modeling of DES and discrete event simulation,performancemeasure Hessian matrix estimation,Stochastic Approximationand so on.General Semi-Markov Processis adapted to describe behaviour of DES and discrete eventsimulation.A general result is obtained and applied to analyze strong consistency of performancegradient Perturbation Analysisestimator.Conditions for effectiveness of InfinitesimalPerturbation Analysisare also discussed.New PA algorithms,such as server PA,PA usingDirac generalized function,job sequence PA etc.,are proposed to deal with discreteparameters.Furthermore,strategies of combining PA algorithms with certain iterative rules areanalyzed widely in order to optimize DES parameters and some SRO algorithms are constructed toslove DES optimization problems.

论文将DES性能分析领域中性能梯度估计和单运行仿真优化作为主要的研究对象，探讨了与性能梯度估计有关的DES和离散事件仿真过程建模、高阶导数估计以及随机逼近等理论和方法；建立了具有一般性的DES和离散事件仿真的广义半Markov过程模型；获得了分析性能梯度估计量强相合性的理论结果和无穷小摄动分析算法应用的条件；提出了诸如服务台数目的摄动分析、奇异摄动分析、串联生产线和加工车间中工件加工序的摄动分析等一系列摄动的思想和算法，对连续参数和离散参数都进行了深入的研究；对摄动分析算法同优化规则结合实现仿真优化的策略也进行了广泛的分析，构造了新型的变界截尾的随机逼近算法，并用于DES的单运行仿真优化研究；最后，给出了DES性能分析方法的实证性研究结果。

The genetic diversity and evolutionary origin of yellow cattle landraces has always been one of the research focuses for animal geneticist both at home and abroad.

中国黄牛的进化起源与遗传多样性一直是国内外动物遗传学家感兴趣的课题之一。

The concept of Genius Loci focuses on the relationship between the human activities and their existent spaces, which could help us understand the meaning about existence and development of architectural environment.

场所的理念以人的现实生活及其与存在空间的互动效应成为线索让我们重新认识建筑环境存在和发展的缘由及意义。

This thesis is an article on Dunhuang culture heritage and it focuses on the geomancy clerks among all sorts of clerks.

本文对敦煌文献数术类文书中的风水类文书进行了全面的整理和研究。

This study focuses on the use of the Geometer's Sketchpad, educational software used to design dynamic visual activities for learning the concept of equivalent fractions.

本研究乃为单一个案研究，在动态几何软体（ Geometer's sketchpad ）的辅助下，利用建构学习及视觉表徵理论，让使用者藉由图像的切割与再分割，来进行为期三周八节课的等值分数补救教学课程。

The first part of the paper focuses on Saddlepoint Programming . It explicates SP's origin background, classification and relationship with other mathematical programing . The optimal conditions of SP has been proven and its geometric interpretation has been made.

文中首先讨论鞍点规划原理，阐明了这种规划产生的工程背景、分类、数学表述及其与一般数学规划的关系；证明了鞍点规划最优性条件的有关定理，并给出了几何解释。

The second part focuses on the history of western traditional geopolitics.

第二部分，西方传统地缘政治理论的历史沿革。

This paper focuses on the application of the methods developed in ISAM to the Borehole Safety Assessment which is based on the Borehole Disposal Concept of Nuclear Energy Company of South African.The hypothetical geosphere and biosphere characteristics for the safety assessment are derived from the radioactive waste disposal site in northwestern China.

本文采用ISAM中开发的评价方法，参考南非原子能公司的钻孔设计概念，并根据我国西北放射性废物处置场的岩石圈和生物圈特性假定场址，对废放射源钻孔处置安全评价方法进行了研究，为我国废源钻孔处置的安全性提供依据。

These representative definitions indicate that community scale and classifying criterion are the focuses of controversies. Ferdinand Tonnies had made a distinction from reality between two ideal types of social groups, community and society, or Gemeinschaft and Gesellschaft.

2从这些较具代表性的社区定义中可以发现，社区规模和分类标准的确定无疑是争论的热点。F-腾尼斯用二分法，从人类结合的现实中抽象出两种理想类型：共同体与社会，又称"礼俗社会"和"法理社会"。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷