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。

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The system performance history mainly includes the backstage database the establishment and the maintenance as well as front ends the application procedure development two aspects.

系统的开发过程主要包括后台数据库的建立和维护以及前端应用程序的开发两个方面。

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At best, watching television can be educational as well as entertaining, but nobody wishes to raise literacy levels by simply sitting in front of a TV box.

电视至多有教育和娱乐功能，但没人指望简单地通过看电视来提高读写水平。

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So, it's very well designed such that they've minimized any of these destructive interference dead sounds. So, it's nice, on a student budget you can go and get the worst seat in the house and you can hear just as well as they can hear up front, even if you can't actually see what's going on.

世界上最好的两三个音乐厅之一,它的设计十分精巧，把任何相干相消,都见到了最低，所以这点对于你们,用学生预算买到一个最差的位置的人,来说是很好的，你们可以听得,像前排一样清楚，虽然你们,可能看不见台上发生了什么。

麻省理工公开课 - 化学原理课程节选

You need to do that to be able to control the shield that's as big as that and as heavy as that, because it is made fundamentally of a heavy wood, typically covered by leather, sometimes with some bronze, a bronze sheet across the front of it as well.

如果你想自如操控这块盾牌就必须得这样,这种盾牌很大并且很笨重,因为它主要是由沉重的木材制成,表面一般覆有皮革,或包上铜皮,就是表面上有一层铜皮

耶鲁公开课 - 古希腊历史简介课程节选

As well as finding front-line staff "deficiencies", the report also said council workers described the girls as making a "lifestyle choice".

BBC: Rochdale child sex abuse still happening: Health worker

Mutu is much more than an out-and-out goalscorer and played on the left as well as up front for Parma last season.

BBC: Mutu key to Chelsea hopes

Mercedes puts air-conditioning controls in the back as well as the front of its cars because people who can afford a Mercedes can also afford a driver.

ECONOMIST: The charms of frugal innovation