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Objectives: Substance use and physical abuse during pregnancy are known health problems that detrimentally affect maternal health and birth outcomes; however, many health professionals pay little attention to these problems. The aims of this study were to estimate the prevalence of substance use and physical abuse during pregnancy in different ethnic groups and to explore the effects on birth weight.

目标：物质使用及受虐是公认危害母体及胎儿之危险因子，但甚少受到医疗工作人员的关注，为协助妇女保健工作之推展，本研究系以问卷资料访谈评估不同种族妇女於怀孕期间物质使用及受虐经验对婴儿出生体重之影响。

The solution of some practical problems in engineering can be regarded as that of periodic solution of nonlinear autonomous systems according to the opinion of mathematics, The problems of this kind are analysed by means of the direct numerical method in this paper,The simple and convenient Draw Newton Method is applied for solving the parameter vectors in iteration course along with the calculation of a practical engineering problem.

日I崖旨J，'口工程中的一些实际问题往往可以归结为非线性自治系统，例如描述同步发电机暂态稳定性问题的转子摇摆方程，即是一典型的非线性自治系统。虽然可以用各种小参数摄动法求解非线性系统，但是这类方法是依据对线性系统的解进行"摄动"来逼近非线性系统解的。因而当系统

In this dissertation, the ideas of simulating directed Hamilton path problems by sticker systems are designed using their massive parallelism; Then some properties of directed graphs and sufficiency and necessity conditions of existing Hamilton paths in graphs are presented based on the analysis to directed Hamilton path problems according to the properties of languages generated by the sticker systems.

本文利用粘贴系统的巨大并行性，首先设计了模拟有向哈密顿路问题的粘贴系统，然后通过此粘贴系统所产生语言的性质对有向哈密顿路问题进行分析，给出了有向图的若干结构性质以及图中存在有向哈密顿路的充要条件。

In this dissertation, research work of near-field numerical simulation is briefly reviewed, some existing problems are analyzed, and the following problems in decoupling numerical simulation, which is a key research direction in present, are studied.

本文简要地回顾了近场波动数值模拟的研究工作，分析了存在的问题，并针对当前的一个主要发展方向—数值模拟的解耦技术，对下列问题进行了研究。

Because of reasons pointed before, a suit of new solution of GPS intelligent inspection system is presented in this paper. This system integrates PPC and GPS receive module compactly, conquers some problems such as instability of system work, fallibility and discommodity of operation. These problems are lead by PPC link GPS through inserting card or line.

鉴于以上原因，结合掌上电脑和GPS的新技术，本课题针对GPS智能巡检系统提出了一套新的解决方案，将掌上电脑和GPS接收模块高度集成为一体，克服了以前插卡或连线式GPS产品导致的系统工作不稳定、不可靠和操作不方便等问题。

You can apply the genetic algorithm to solve a variety of optimization problems that are not well suited for standard optimization algorithms, including problems in which the objective function is discontinuous, nondifferentiable, stochastic, or highly nonlinear.

你可以应用遗传算法来解决一些不适合标准最优化算法的优化问题。这些问题包括：目标函数不连续，不可微分，随机，或者高度非线性

Compared with the initial value problems of scalar conservation laws with smooth flux function, the global weak entropy solutions for the initial-boundary value problems of scalar conservation laws with weak discontinuous flux function include the following new interaction types: a rarefaction wave collides with the boundary and is absorbed compltetely or partially by the boundary; a rarefaction wave collides with the boundary and the boundary will reflect a contact or non-contact shock wave; a contact or non-contact shock wave collides with the boundary and is absorbed by the boundary; a contact or non-contact shock wave collides with the boundary and a new non-contact shock will rebound from the boundary simultaneously or later.

与具有光滑流函数的单个守恒律的初始值问题相比，具有弱间断流函数的单个守恒律初边值问题的整体弱熵解中包括下列新的相互作用类型：稀疏波碰到边界并被边界部分或全部吸收；稀疏波与边界相撞，边界反射出一个接触或非接触激波；接触或非接触激波碰到边界并被边界吸收；接触或非接触激波与边界相撞，边界同时或稍后反射出一个新的非接触激波。

The previous applications of Hopfield model were restricted to problems with 0-1 discrete design variables and liner programming problems.

本文进一步探讨了Hopfield网络求解约束非线性优化问题的方法，并将其应用于4杆桁架的结构优化设计。

According to some practical examples, this thesis gives the basic definition and uniform form of inverse problems and ill-posed problems, and then operator equation is got by discursion.

本文从一些实例出发，给出了反问题和不适定问题的基本概念及反问题的统一形式，从而得出了算子方程。

However, what happened to foreign countries in the commercial space has been disturbing us, with environment problems, traffic problems, separation and disorderliness between the commercial architecture and urban space the most serious.

随着城市更新速度的飞速发展，人们生活方式的多元化趋向，我国城市商业空间的发展也日新月异，但同时也面临着国外曾出现过的许多问题的困扰：环境问题、交通问题以及商业建筑与城市空间脱节、无序等状况显得尤为突出。

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