Third, high tariff and threatened by the challenge from the terrestrial system;
三是通话费用高，各地价格差别大，且受到地面系统的有力挑战；
Wetlands are formed by the interaction between terrestrial system and aquatic system.
湿地是由陆地系统和水体系统相互作用形成的自然综合体。
The studies on HAPS system sharing C-band with satellite and terrestrial systems are also discussed.
就高空平台通信与卫星和地面微波通信在C频段的共存问题试作探讨。
Impulsive solar activities are very important sources of disturbances in the solar-terrestrial system.
爆发型太阳活动是日地系统中重要的扰动源。
The energy conservation equations in conventional inertial system and conventional terrestrial system are introduced.
介绍了惯性系和地固系下的能量守恒方程。
The energy coupling process in the Solar-Terrestrial system and it global character is one of the important subjects in space physics.
日地系统的能量耦合过程和该系统的整体行为是当前空间物理学的重要课题。
This terrestrial digital broadcast system means that more people will be able to use the service.
这种地面数字电视广播系统使得更多人能够使用这项新服务。
Most models of planets assume that they are similar to the terrestrial planets in our own Solar System, with about half as much carbon as oxygen in the atmosphere.
而多数行星模型均假设它们和我们太阳系的类地行星相似，即在大气中碳含量是氧含量的一半左右。
With the broad application of advance technology in ship power system, and its differences from the terrestrial power system, it is necessary to build up the model and simulation of ship power system.
随着新技术、新设备的广泛应用，由于全电力推进的船舶电力系统与陆地电力系统的差别，需要对全电力推进的船舶电力系统进行建模与数字仿真。
ScienceDaily (Dec. 20, 2010) —Study suggests that trace amounts of water created oceans on Earth and other terrestrial planets, including those outside the solar system.
《每日科学杂志》(2010年12月20日)——研究表明微量的水创造了地球和其他类地行星上的海洋,包括那些在太阳系以外的类地行星。
In digital terrestrial television system, there is much burst and random noise in the broadcasting channel, and burst noise is more harmfully than random noise.
在地面数字电视系统中，广播信道存在着突发噪声干扰和随机噪声干扰，而且前者的危害甚于后者。
In this paper, a new designing method lor terrestrial use solar cell power system is presented.
本文讨论了太阳电池发电系统的一种设计新方法。
It is an important mission of Geodesy to improve an accuracy of control networks and to establish the geocentric coordinate system via combined satellite and terrestrial network adjustment.
通过地面网与卫星网的联合平差，以改善网的精度和建立高精度的地心坐标系统，是当前大地测量的一项重要任务。
The digital television terrestrial broadcasting system is important constituent in the broadcasting television system.
地面数字电视广播系统是广播电视系统中的重要组成部分。
The grassland agricultural ecosystem, including the primary production system, the second production system, social system and so on, is the biggest among the terrestrial ecosystems.
草地生态系统是最大的陆地生态系统，包括草地植物生态系统、动物生态系统和人类社会系统等子系统。
Known in a complete digital TV system, Live satellite, cable digital TV and terrestrial digital TV is a trinity frame, lack of which will cause a damaged.
众所周知，在一个完整的数字电视体系里，直播卫星、有线数字电视和地面数字电视是三位一体的构架，缺谁都将会造成一个残缺。
Interaction between terrestrial ecosystem and climate system with the impact of human activities is one of the key scientific issues in the yield of global change research at the present time.
人类活动影响下，陆地生态系统和气候系统的相互作用已成为目前全球变化研究的主要科学问题之一。
This paper describes the realization of ATSC 8-VSB Modulator of the VSB-based HDTV terrestrial broadcasting system by using almost all digital methods.
本文介绍了一种用数字方式实现美国数字电视地面广播系统中的8VSB调制器的方法。
The high terrestrial plants cultivated with recycling water system is a kind of phytoremediation system with a low cost , simple construction and high purification efficiency.
高等陆生植物循环水培系统是一种成本低廉、结构简单、净化效果显著的植物修复系统。
The hardware design of the receiver according to the merged blue print for digital terrestrial television system in China was completed in this project.
本项目完成的是中国地面数字电视融合方案接收系统的硬件平台设计。
This paper describes the basic theory of speech compression encoding and decoding algorithm in TETRA (terrestrial trunked radio) system.
研究了陆地集群无线通信（TETRA）数字集群移动通信系统的语音压缩编解码算法的基本原理。
An intelligent transport system based on Digital Terrestrial Multimedia Broadcast (DTMB) is proposed, and its server system is implemented.
提出一种基于数字电视国标(DTMB)的智能交通导航系统，并实现其服务器部分。
Tells the terrestrial digital broadcast system work mode, satisfy business, Transmission network operation is good, To ensure quality of receiving, More guarantee network normal operation.
讲述了地面数字电视广播系统中工作模式满足业务要求，传输覆盖网的运行良好，对保证接收质量重要，更保证覆盖网正常运行。
Compared with cable digital TV and satellite digital TV, channel to the environment of terrestrial digital TV transmission system is more complex.
与有线数字电视和卫星数字电视相比，地面数字电视传输系统中的信道环境要复杂的多。
In DVB satellite transmission system used QPSK, using QAM cable transmission, terrestrial transmission using COFDM (coded orthogonal frequency division multiplexing) way.
在DVB系统中卫星传输采用QPSK，有线传输采用QAM方式，地面传输采用COFDM(编码正交频分复用)方式。
The global changes will bring about extensive influence on the terrestrial ecosystem system and social economic system necessarily.
全球气候变化必将对陆地生态系统以及社会经济系统产生广泛的影响。
Eogene System is the fundus of terrestrial heat exploitation and Neogene System is the principal heat reservoir and exploitation bed of Henan plain.
老第三系(E)是河南平原地热开发基底，新第三系(N)是主要热储层和开采层。
Base on the analysis of terrestrial transfer channel, the paper introduces the DVB-T standard, and discuss the core COFDM technology as well as front-end transmit system structure.
文章在分析地面传输信道特性的基础上，介绍了地面广播数字电视的DVB - T标准，探讨了其核心的正交编码频分多路复用COFDM技术、前端发射设备的系统结构及其优缺点。
As an important and special ecological system on the earth, wetland is one of important living environment of human being in the transition zone between terrestrial ecosystem and aquatic ecosystem.
湿地作为地球上一种重要且独特的生态系统，处于陆地生态系统与水生生态系统的过渡地带，是人类最重要的生存环境之一。
As an important and special ecological system on the earth, wetland is one of important living environment of human being in the transition zone between terrestrial ecosystem and aquatic ecosystem.
湿地作为地球上一种重要且独特的生态系统，处于陆地生态系统与水生生态系统的过渡地带，是人类最重要的生存环境之一。
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