The change and the development of curriculum theories and thoughts stem from the curriculum reform , and it is the reflection of the curriculum reform which keeps put forward some problems 课程理论和思想的变化与发展来源于课程改革，是课程改革实践的反映。课程改革实践不断提出一些问题，当已有的课程理论和思想不能指导或解决这些问题时，就迫使人们思索新的课程思想和理论。
The research work in this dissertation carries a deep study on new techniques of prn and put emphasis on the multiple access protocol to support the integration of smart antennas with prn . the major achievements are outlined as follow 近年来，诸多新的应用对分组无线网的研究和发展不断提出新的挑战；另一方面，通信和微电子技术的迅速发展又为分组无线网的发展创造了良好的契机。
Telecommunication technology changes with each passing day , and it continually put forward new demands on speech coding . during the past 20 years , several standards of speech coding have been specified . such achievements surpass the work done two decades ago 语音通信技术日新月异的发展,对语音编码不断提出新的要求,在过去20年中,产生了许多语音编码标准,超过了以往许多年的工作。
Tradition that database technique that data is a single data resources , namely the database is a center , and proceed to be engaged in the business handling , criticize handling , the decision and analyze and so on 随着计算机技术的飞速发展和企业界不断提出新的需求，数据仓库技术应运而生。传统的数据库技术是单一的数据资源，即数据库为中心，进行从事事务处理、批处理到决策分析等各种类型的数据处理工作。
Although dsu is one significant achievement of wto , there still exist institutional and procedural deficiencies . considering so many unresolved disputes and suggestions from wto members , the rules and procedures of dispute settlement is necessary to be further improved 尽管《谅解》是wto的重要成就，但从wto近年大量未决争端以及各成员不断提出的建议来看， 《谅解》存在着制度方面和程序方面的不足，争端解决规则和程序有进一步改进的必要。
By reviewing the history of mathematics , especially the three times of crisis in the history , we find its logic of development is a process of problem posing and inquiring and solving . it has a long history since the problematic phenomena were considered in the instruction 在研究过程中，我们认为，数学发展的逻辑是一个不断提出问题、分析问题、解决问题的过程；而在教育中，无论是作为教学现象，还是作为教学思想，教学中的问题性可以说也是由来已久。
Investors have been asking for years if the frantic innovation in finance , especially the securitisation of just about every form of debt into a tradable asset , was a way to spread risk efficiently , or whether this left the financial system prone to rare ? but cataclysmic ? failures 多年来，投资人不断提出一个问题，即金融系统内狂热的革新做法特别是将几乎所有类型的债务证券化为交易资产的举措，是否会有力地扩散风险，或是导致金融体系易于遭受罕见但严重的挫折。
The countess could not conceive of life being possible without the luxurious surroundings to which she had been accustomed from her childhood ; and without any idea of its being difficult for her son , she was continually insisting on having a carriage , which they had not , to send for a friend , or an expensive delicacy for herself , or wine for her son , or money to buy a present , as a surprise for natasha , for sonya , or for nikolay himself 伯爵夫人简直无法想象如果缺乏她从小过惯的奢侈环境怎样生活下去，她不知道儿子有多艰难，还不断提出各种要求：时而要马车去接熟人此时他们家已没有马车了，时而为自己要佳肴美食或者为儿子要美酒，时而要钱为娜塔莎索尼雅和尼古拉买一件他们意想不到的高级礼物。
According to this , the study on radio frequency ( rf ) and communications integrated circuit ( ic ) becomes very popular . at the same time , under the drastic market competition , telecommunication system requires the rfic with low cost , low power consuming and multi - function . the development of rfic techniques will follow the same way as the digital ic does , and cmos technology will be implemented for rfic finally 与此同时,在市场竞争日趋激烈的推动下,通讯系统对射频集成电路( radiofrequencyintegratedcircuits )不断提出低成本、低功耗、多功能的要求,射频集成电路的技术优化会沿着和数字ic一样的发展道路,最终选择cmos技术来实现rfic ;目前,各种无线通信标准并存,但市场份额最大的还是gsm系统。
Mobile ad hoc network ( manet ) is a self - organizing and self - configuring multi - hop wireless network without predefined infrastructure , where the network topologies , traffic model and channel environment dynamically change with node mobility . it can establish instant communication infrastructures for civilian and military applications 移动adhoc网络是一种非常具有发展潜力的网络，也是一个复杂的系统，所涉及的研究内容非常广泛，目前仍存在一些需要彻底研究的问题，而新的应用也对它的研究和发展不断提出新的挑战。
