【正文】 advanced science and technology activities in Dalian youth units。從圖中可以看出，某一載 波可在兩個不同的地理區(qū)域重復使用，只要這兩個地區(qū)離的足夠遠，相互之間的 干擾足夠小。小區(qū)的形狀是不規(guī)則的，這取 決于是否有現(xiàn)成的基站，地理地形，無線電信號傳播中存在的障礙，等等。質量改進的原因 還在于使用先進的技術如電源控制或跳頻改善了無線連接的控制,，傳播條件的適應性等。此外，電話費用也降低了，因為GSM 是國際標準，生產(chǎn)數(shù)量大，競爭水平高。和這些系統(tǒng)相比，GSM 提供的更重要的第二代數(shù)字系統(tǒng)主要優(yōu)勢 體現(xiàn)在： 〃標準化； 〃容量； 〃質量； 〃安全。隨著美國后來在GSM 領域制造了一個詞條PCS1900 作為GSM 的拓展,GSM 系統(tǒng)已發(fā)展至 各大洲,并且縮寫詞GSM 現(xiàn)在已可以代表移動通信的全局系統(tǒng)。每個國家開發(fā)了它自己的系統(tǒng)，在設備和操作 上是互不相容的。ISDN patibility In 1989, GSM responsibility was transferred to the European Telemunication Standards Institute(ETSI), and phase I of the GSM specifications were published in service was started in mid1991, and by 1993 there were 36 GSM networks in 22 standardized in Europe, GSM is not only a European 200 GSM networks are operational in 110 countries around the the beginning of 1994, there were million subscribers worldwide, which had grown to more than 55 million by October North America making a delayed entry into the GSM field with a derivative of GSM called PCS1900, GSM systems exist on every continent, and the acronym GSM now aptly stands for Global System for Mobile developers of GSM chose an unproven(at the time)digital system, as opposed to the thenstandard analog cellular systems like AMPS in the United States and TACS in the United had faith that advancements in pression algorithms and digital signal processors would allow the fulfillment of the original criteria and the continual improvement of the system in terms of quality and over 8,000 pages of GSM remendations try to allow flexibility and petitive innovation among suppliers, but provide enough standardization to guarantee proper interworking between the ponents of the done by providing functional and interface descriptions for each of the functional entities defined in the General Concepts Analog Versus Digital Telephony Systems Firstgeneration systems were the early 1980s these underwent rapid development in the NMT system was used by all the Nordic countries, and the TACS system in the United Kingdom and Italy, there was a variety of systems and no patibility among with these systems, the main advantages offered by GSM, which is the most important of the secondgeneration digital systems, are: 社保、教育、技術研究，則會消除人們存錢的預防養(yǎng)老動機從而擴大消費，利于中國經(jīng)濟可持續(xù)發(fā)展。中國的 GDP 總量 高居世界第二，但人均 GDP 在世界的排名卻還在百名開外，窮人還是絕大多數(shù)。這就意味著要加大對交通基礎設施的投資，但是政府在加大交通基礎設施投資力度的同時，用于改善民生的措施實際卻在相對地減少。關鍵詞列表：中文關鍵詞列表（用換行符或,隔開）第二篇：英文翻譯Introduction: with the rapid development of the economy, China ‘smprehensive national power has been improved a saying said。武廣高鐵總投資約 1166 億元，目前的線路至少能開 120 對車，但實際上只開了 33 對，而且還坐不滿，這是資本的嚴重浪費。建成之后會與高速公路、現(xiàn)有鐵路、飛 機、船運形成競爭關系，在原有運力并不緊張的背景下必然形成運力過剩。Ability to support handheld terminals Quality。GSM 不僅僅是歐洲標準，盡管它是在歐洲 規(guī)范化的。第一代系統(tǒng)是模擬的。因為網(wǎng)絡的功能元件和這些元素之間的接口被規(guī)范化，操作員可以從不同的 供營商購買。頻率復用意味著同一載波可以在不同的地區(qū)重復使用。每個 小區(qū)有一個收發(fā)基站（BTS），其中，以避免相鄰小區(qū)的不同無線信道在運行時 產(chǎn)生相互干擾。一個基本的區(qū)群組織的結構如圖1 所示。graspingcharacteristics, treeing famous“ as the school ideas.”Innovation in operating a school, Distinctive Features,“ as the school school has been named the standardization of school facilities,education and management of Dalian advanced group, Green School of Dalian , big break in Dalianadvanced unit for physical education curriculum standard education health system,development zone course reform summary advanced unit, the characteristics of the development of schoolbased curriculum development awards such as prizes, Excellence Award and many other addition, teaching and research training center was also named the Development of information technology, sports, music, experimental point of school