例句與造句

1. This article discusses some interactive services delivered via digital television ( dtv ) system with or without return channels . the method proposed here for the implementation of these services is simple and economical for hybrid dtv system
   對(duì)數(shù)字電視中的一些交互業(yè)務(wù)進(jìn)行了討論，并針對(duì)目前電視系統(tǒng)的特點(diǎn)提出了簡(jiǎn)單實(shí)用的實(shí)現(xiàn)交互數(shù)字廣播的方法。
2. It's difficult to find return channel in a sentence. 用return channel造句挺難的