引入

In this paper we combining connecting tunnel project of Subway Line 4 at Xidan-lingjing bystreet in Beijing. To aim at the difficulties of building large-span connecting tunnels in the fine sand layer, through roads and underground pipelines, construction nearby buildings and other project difficulties. Using theoretical analysis, numerical simulation, field tests and other research methods to comprehensive and systemic research the stratum deformation mechanism and process control techniques of shallow excavation method, and a series of results were obtained. Firstly, use the stochastic media theory to analyze the stratum deformation mechanism, concretely analyze the analytic equation of surface horizontal displacement and deformation which were caused by the excavation of single-hole and double-hole tunnel, and further discussion on ground settlement, vertical deformation, surface horizontal displacement and horizontal deformation. Analyzing the main influence factors of surface displacement, and combined with practical work to proof the theory which was applied to shallow buried single-hole tunnel in fine sand layer was scientific.

本文结合北京地铁四号线西单～灵境胡同渡线隧道工程，针对在粉细砂地层中修建大跨渡线隧道，下穿道路和地下管线，临近建筑物施工等工程难点，利用理论分析、数值模拟、和现场监测等多种研究手段，对浅埋暗挖隧道地层变位机理及控制技术，深入地进行全面和系统的研究，并取得以下成果：(1)引入随机介质理论，对地层变位机理进行了分析，具体分析了单、双孔隧道开挖引起的地表位移及变形的解析方程，并深入探讨了地表沉降、垂直变形、地表水平位移和水平变形的特点，同时分析了影响地表位移的主要因素，并结合工程实例，佐证该理论应用于粉细砂地层浅埋暗挖单孔地铁隧道的科学性。

In order to ease up the gap between CPU and memory,cache is introduced between them.

为了缓和CPU与存储器之间的速度差距，在计算机系统的CPU与主存之间引入了cache。

The orchestra joins in after some time, reintroducing the piano's cadenza theme, while the soloist's part still flows across the octaves.

过了一段时间，交响乐团加入了进来，重新引入了钢琴的华彩乐段主题，独奏者仍然在几个八度之间游走着。

The effects of alcohol nature and calcine temperature on the resultant CeO2 nanoparticles were investigated, and the influence mechanism of nano-CeO2 size on the roughness of GaAs wafer was also discussed.

研究了醇的引入及煅烧温度对粉体性能的影响，并就纳米CeO2磨料尺寸对GaAs晶片抛光后表面粗糙度的影响机理进行了探讨。

Then, method for calculating ultimate bearing capacity of element of SFRC with steel bars which is unified by introducing the concept of strengthening item which is related to the characteristics of steel fibre andconcrete, has been studied.

本文对配筋钢纤维混凝土构件极限承载力的计算方法进行了研究，引入与基体强度有关的增强项的概念使配筋钢纤维混凝土构件极限承载力的计算方法得到了统一。

Bsed on real circumstances of TV transmitting station,the artiele presents a methodof calculation of field strength in case the radiowave is affected by ground objectsand meteorological conditions,and that of approximate calculation of field strengthIn penumbra areas,and so on,A method of calculating field strength in city is alsopresented with int...

文章从电视发射台的实际情况出发，介绍了电波受地物、气象等影响时的场强计算方法和半阴影区的近似场强计算方法等。还介绍了在城市的电波计算中，引入"建筑物密集度"参数的场强计算方法。

Systematically analysing the method on the failure approach of patten recognition of the flood control hydro-project system, combining the social economical efficiency of the flood control system"s invalidation losses, the paper provides the concept "flood disaster risk " and constitutes the failure analysis approach of patten recognition system on the base of the flood progress. Combining with the subsystem functions and the failure probabilistic analysis of the hydro structure, the paper discusses the main failure approach of patten recognition and calculus of failure probability, calculates flood control hydro-project"s total risk.

3系统分析了防洪工程系统失效模式识别的方法，结合防洪抗灾系统失效损失的社会经济性，引入洪灾风险概念，建立了基于洪水过程的系统失效模式识别体系，结合各水工结构子系统功能和失效概率分析，讨论了主要失效模式识别和失效概率计算，对防洪工程系统总风险进行了计算。

with the gradual introduction of computer technology in the management of schools, the use of computers to conduct attendance management in schools is gradually popularized.this attendance management system uses vb2005 + sql2005 combined the attendance machine network to achieve, it enables the school through this system intuitived understanding the students to the class study situation, it changes the condition to depend on call-over and statistics manually in the past, and enhances the school administration efficiency.

随着计算机技术逐渐引入学校的管理，运用计算机来进行考勤管理逐渐在学校中普及。本考勤管理系统用vb2005+sql2005结合考勤机网络来实现，使学校通过这套系统能够直观的了解学生的到课学习情况，改变过去靠手工来点名和统计，提高了学校管理效率。

I was the last kid that he brought through - he had already introduced Ian Callaghan, Chris Lawler and Tommy Smith and I was the last one - so for me to be playing under Shanks at 20 years of age in 1974, it was just a dream come true.

我是他选入的最后一个球员。此前他已经引入了伊恩-卡拉汉、克里斯-劳勒和汤米-史密斯，而我是最后一个。1974年在我20岁的时候能在香克利的带领下踢球，我实现了我的梦想。

This is why the signing of Manchester United's Ruud van Nistelrooy was put on the backburner by Camacho as soon as he arrived, as he would only act as more competition to Ronaldo.

这就是为什么卡马乔不同意引入曼联前锋范尼的原因，他的到来只能增加罗纳尔多的竞争。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。